uxcell ER20 ER20-1/8 Stainless Steel CNC Milling Spring Collet Product Name : Spring Collet;Model No. : ER20 Clamping Diameter : 4mm/ 1/8;Overall Size : 22 x 32mm/ 0.9" x 1.3"(Max.Dia*H) Material : Stainless Steel;Color : Silver Tone Net Weight : 41g Package Content : 1 x Spring Collet Chuck