uxcell ER40 Collet Clamping Nuts for CNC Milling Chuck Holder Lathe Product Name : Collet Nuts;Model : ER40 Hole Diameter : 33mm/ 1.3";Thread Diameter : 51mm/ 2" Overall Size(Approx.) : 62 x 25mm/ 2.4" x 1.0" (D*L);Material : Metal Color : Black;Net Weight : 277g Package : 1 x Collet Nuts