Lathe-Compatible Expanding Mandrel

Designed exclusively for lathe-mounted ring turning, this stainless steel expanding mandrel measures 7 inches long with a 1/2-inch shank for secure chuck engagement. It adjusts across UK ring sizes L to R½ (US 7.5–10.5) using the included hex key, delivering repeatable, snug fits without slippage. Manufactured from wear-resistant stainless steel, it avoids the dimensional drift and surface degradation seen in lower-grade alternatives. Extra space at each size setting permits safe application of protective tape — essential for preserving interior finishes on fine jewellery pieces. No assembly or calibration required; ready to mount and use immediately after sizing.