uxcell ER11-1/4 CNC Workholding Engraving Spring Collet Milling Lathe Tool Product Name : Spring Collet;Model No. : ER11-1/4 Clamping Diameter : 6.35mm/ 0.25";Overall Size : 11 x 18mm/ 0.43" x 0.7"(Max.Dia*H) Material : Carbon Steel;Color : Silver Tone Net Weight : 8g Package Content : 1 x Spring Collet