uxcell C20-ER25-100L Straight Collet Chuck Milling Lathe Extension Rod Product Name : Straight Collet Chuck;Model : C20-ER25-100L Shank Diameter : 20 mm / 0.8";Clamping Diameter : 20 mm / 0.8" Overall Size : 145 x 40 mm / 5.7" x 1.6" (L*Max.D);Material : Carbon Steel Color : Silver Tone, Black;Net Weight : 418g Package Content : 1 x Straight Collet Chuck