uxcell C12-ER11-150L Straight Collet Chuck Milling Lathe Extension Rod Product Name : Straight Collet Chuck;Model : C12-ER11-150L Shank Diameter : 12 mm / 0.47";Clamping Diameter : 8.5 mm / 0.33" Overall Size : 175 x 20 mm / 6.9" x 0.8" (L*Max.D);Material : Carbon Steel Color : Silver Tone, Black;Net Weight : 164g Package Content : 1 x Straight Collet Chuck