uxcell Industry Taper Shank R8 10mm Dia Spring Collet for Milling Machine Product Name : R8 Spring Collets;Main Material : Metal Color : Black, Silver Tone;Style : R8 &phi;10 Interior Hole Diameter : 10mm/ 25/64";Thread Diameter : 10mm/ 25/64" Exterior Diameter : Small: 24mm/ 0.94" & Big: 32mm/ 1.26";Total Height : 10.2cm/ 4" Weight : 321g;Package Content : 1 x R8 Spring Collets