uxcell ER25 Collet Clamping Nuts for CNC Milling Chuck Holder Lathe Product Name : Collet Nuts;Model : ER25 Hole Diameter : 21mm/ 0.8";Thread Diameter : 32mm/1.3" Overall Size(Approx.) : 42 x 21mm/ 1.7" x 0.8" (D*L);Material : Metal Color : Black;Net Weight : 100g Package : 1 x Collet Nuts