Mandrels & Sizing

Achieve precise ring sizing and forming with our curated selection of essential jeweller's tools, built for durability and accuracy. These are the instruments that shape your creations.

This collection provides the fundamental tools for any bench jeweller or silversmith focused on ring, bangle, and bracelet work. From initial shaping to final sizing, these items are used daily for creating and modifying metalwork. When choosing, consider the material hardness required for your specific metals – hardened steel for precision and durability, or wooden options for non-marring forming on softer metals. Gauge accuracy is paramount for consistent results.

What's in this collection

  • Ring Mandrels — For accurately forming and sizing rings, available in round or stepped designs for various applications.
  • Bangle & Bracelet Formers — Essential for shaping cuffs and bangles to consistent diameters and curves.
  • Ring Sizing Tools — Including gauges, machines, stretchers, and reducers for precise diameter adjustments.
  • Wooden Mandrels — Offering a gentler forming option, ideal for precious metals to avoid surface damage.

Tested at our Birmingham bench

Here at Toolsmith Ltd, every item in this collection is rigorously assessed in our Small Heath workshop. We work directly with trade silversmiths and jewellers, putting these tools through their paces on real-world projects. This hands-on inspection ensures each mandrel, sizer, and former meets the demanding standards of professional use, guaranteeing reliable performance and a quality finish you can depend on.

Browse the full range below, or read our buying guides on the Bench Journal.
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From the Bench Journal

Mandrels & sizing — buying & technique guides

Mandrels & sizing — frequently asked questions

Answers from our Birmingham bench, written by working jewellers and silversmiths.

Which ring mandrel should I choose for resizing?
For general resizing, a steel numbered mandrel (e.g., UK 1-17) is essential. If you're working with delicate or intricate rings, consider a wooden stepped mandrel for gentler forming. For bangles and bracelets, a corresponding bangle or bracelet former is required.
What's the difference between a ring stretcher and a ring reducer?
A ring stretcher works by expanding the metal, typically using a tapered mandrel and a lever action. A ring reducer, conversely, compresses the ring, often using dies or a hammer action on a reduction anvil. They serve opposite but complementary functions in ring sizing.
I need to shape a new bangle. What tool is best?
For shaping bangles, a dedicated bangle mandrel or bracelet former is most suitable. These are often larger and more robust than ring mandrels, providing the necessary support and form to curve wire or sheet metal into a bangle shape. Ensure the diameter matches your desired size. For example, the 15 Inch Oval Steel Mandrel is ideal for this purpose.
How do I use a ring sizing stick or gauge?
A ring sizing stick, like a numbered mandrel, is used by sliding the ring onto it until it stops. The number or mark where the ring rests indicates its size. A ring gauge set is a collection of finger-sized rings used to try on the customer's finger to determine their size. For accurate ring sizing, consider the Premium Metal Ring Sizer Stick Mandrel.
What should I look for in a good quality ring mandrel?
Prioritise hardened steel for durability and a precise, consistent taper. The markings should be clear and etched, not printed, to withstand wear. A smooth, well-finished surface prevents scratching the jewellery. For wooden mandrels, look for dense hardwoods with a fine grain. A tool like the Cast Iron Bracelet Steel Stepped Mandrel offers excellent durability.
What's the difference between a stepped mandrel and a tapered mandrel?
A tapered mandrel has a continuous, smooth reduction in diameter. A stepped mandrel has distinct, uniform diameter sections. Tapered mandrels offer infinite sizing points, ideal for fine adjustments. Stepped mandrels are useful for creating specific, repeatable diameters or for certain forming techniques, such as those using a stepped mandrel.
What steel grade is typically used for your mandrels?
Our steel mandrels are generally manufactured from hardened and tempered high-carbon steel. This provides excellent durability and resistance to deformation. The specific hardness can vary, but they are designed to withstand repeated hammering and forming without significant wear. For robust options, consider our steel mandrels.
Are your ring mandrels anodised or plated?
Our steel mandrels are typically not anodised or plated. They are usually finished with a smooth, polished surface to prevent damage to the jewellery being worked on. Some wooden mandrels may have a light, protective finish, but this is clearly stated in the product description. You can find various types of mandrels on our mandrels and sizing page.
How does a ring sizing machine fit into a jeweller's workflow?
A ring sizing machine, like a stretcher or reducer, streamlines the sizing process. Instead of solely relying on hammering or manual expansion, it provides controlled, consistent adjustments. This saves time, reduces the risk of damaging the ring, and ensures accuracy, especially for multiple sizings. For manual adjustments, a ring sizer stick mandrel is a fundamental tool.
When would I use a bracelet former versus a ring mandrel?
A bracelet former is specifically designed for the larger diameters and often oval or irregular shapes of bracelets and bangles. While a large ring mandrel can approximate this, a dedicated former offers better support and a more accurate curve, preventing distortion and ensuring a professional finish. The 15 Inch Oval Steel Mandrel is an excellent example of a bracelet former.
Do you offer same-day dispatch for mandrels and sizers?
Yes, orders placed before 2pm Monday to Friday are dispatched the same day from our Birmingham warehouse. We offer free UK delivery on all orders over £30. For smaller orders, standard delivery charges apply. Returns can be processed within 30 days for unused items. Browse our selection of mandrels and sizers for your jewellery making needs.
Can I get trade pricing for workshop supplies?
Absolutely. We offer trade pricing for professional jewellers and silversmiths. Please email us at info@toolsmithltd.co.uk with your workshop name and an estimate of your average monthly spend. We can then set up a trade account for you. We stock a wide range of tools, including various mandrels and sizing tools.