Specifications 1.ER collet 2.Made in spring steel and rang from 1-30mm 3.Precision:0.005mm ... (mm)DL1dOrder NoER8813.51.5,2.0,2.5,to 5YS0539ER1111.5181.0,1.5,2.0,2.5,3.0,to 7YS0540ER1617271.0 ... ,2.0,3.0,4.0 to ... 16,11/21,3/8,13/32,7/16,1/2,17/32,9/16,5/8YS0543ER3233401/16,3/32,1 ... 16,11/21,3/8,13/32,7/16,1/2,17/32,9/16,5/8,21/32,11/16 ...