Short Description: Clamping force, clamping range, specifications complete,high precision.Widely used in wire, milling, boring, dilling,tapping, CNC, carving, spindle machine, such as processing work.13Pcs ER11 Collet Set Gripping Range: 1MM to 7MM (1mm,1.5mm,2mm,2.5mm,3mm,3.5mm,4mm,4.5mm,5mm,5.5mm,6mm,6.5mm,7mm).Made of high grade 45 gauge steel.The inner bore processing by high precision grindingaccording to DIN standard.For CNC milling Lathe Tool & Work holding Engraving machine.Color: silverMaterial: 45 gauge steelUse for clamping screw tap, drill , milling cutter,reamer and so on.Having tension and compression function, brilliantand changeable.Package Contents:13 x ER11 Collet ChuckOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.