uxcell Machine ER-11 4mm 5/32" Stainless Steel Spring Collet Chuck Product Name : Spring Collet;Model No. : ER11 Clamping Diameter : 4mm/ 5/32";Overall Size : 11 x 18mm/ 0.4" x 0.7"(Max.Dia*H) Material : Stainless Steel;Color : Silver Tone Net Weight : 8g Package Content : 1 x Spring Collet