... used for boring, milling, drilling ER miling Collets chuck sets ER collets DIN6499 full sizes from ... of processing, including drilling, milling tapping &grinding.ER spring collet 1.material:65 Mn 2.precision ... : ERER Milling Collet Collet CNC lathe chuck ER,OZ, Sealing collet chuck High accuracy:0.005mm ... ...Model Number: ER ColletER Collets, detailed sizes are as below: ...