uxcell Clamping Range 6-7mm ER11 Precision Spring Collet Reaming Part Product Name : Spring Collet;Model No. : ER11 Clamping Range : 6-7mm/ 0.24"-0.28";Clamping Diameter : 7mm/ 0.28" Overall Size : 12 x 18mm/ 0.5" x 0.7"(Dia*Length);Material : Stainless Steel Color : Silver Tone;Net Weight : 5g Package Content : 1 x Spring Collet