DIN6499B ER collet 1.Special elastic steel material 2.Power clamping ability,precise accuracy 3.ER8/11/16/20/25/32/40/50 DIN6499B ER collet 1.Made of special elastic steel material 2.Power clamping ability,precise accuracy 3. Used for boring,milling,drilling,tapping,grinding and engraving operation etc.ER8 1~5ER11 1~7ER16 1~10ER20 1~13ER32 2~20ER40 3~26ER50 6~34