Ring Size Capacity: 8 - 15 Finger Size US Steps on Collet Holder: 7 - Each having a Width of 1/4inch + Fixture Tool: 3 Parts - Metal Base - Stepped Collet Holder - Tapered Pin Overall Length: 6-1/4inch Colour:silver Material:aluminium alloy Size:15.8 x 2.45cm Package Contents: 1 x ring stretcher enlarger 1 x Metal Base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.