Like many of NT Tool's collet holders, the SDM utilizes 12° taper FDC collets. By using a more gradual taper than 16° ER collets, FDC collets grip the cutting tool more evenly, increasing gripping ...

All Mega ER holders are now sold without a standard clamping nut so ... but does not have a ball bearing raceway and has a special friction coating to help collet clamping. Standard has no coolant ...