Uxcell a15122600ux0055 ER20 1/2" Clamping Dia CNC Engraving Milling Machine Spring Collet, Product Name : spring collet;model no. : ER20 Clamping diameter : 1/2";accuracy : 0.015 Overall size : 20x32mm/ 0.8"X1.3"(Max.Dia*h);material : steel Color : Silver Tone;Net weight : 28G Package Content : 1 x spring collet