Steel Ring Mandrel With US Size & HK Size

The solid, high-tensile steel bench mandrel engineered for ring measurement, rounding, and structural mallet reshaping. When modifying a precious metal band—whether rounding out a warped shank or stretching a ring to a larger size—lightweight aluminum or polymer sticks will dent and deform under impact. This Steel Ring Mandrel provides an unyielding metallic anvil core. Machined from solid tool steel and paired with a heavy-duty knurled grip, it functions perfectly as both a high-precision sizing gauge and a rugged workshop stake capable of absorbing repeated mallet blows during intensive jewelry modifications.

Advantages

• Solid Tool-Steel Core: Forged from high-density structural steel to ensure absolute rigidity. It will not flex, compress, or nick under standard bench modification forces.

• Deep-Grooved Calibrated Scales: Features permanent, crisply engraved graduation markings around the entire circumference of the barrel, remaining fully visible even under heavy workshop usage.

• Diamond-Knurled Anti-Slip Handle: The base handle features an integrated, high-traction cross-hatched knurling. This provides a secure grip for manual hand operations and allows the handle to be clamped firmly into a bench vise for hands-free work.

• Dedicated Single-Market Layouts: Available in two distinct standalone scale configurations to optimize specific measuring workflows:

  • Model US Scale: Calibrated precisely for standard US Sizes 0 to 13.

  • Model HK Scale: Calibrated precisely with a crown hallmark emblem for standard Hong Kong Sizes 1 to 33.