CMM Styli & Extension Kit M2 Threads This is a great starter kit for CMM users that want to get more out of their CMM with a wider variety of styli and extensions. Included in this kit are the following... 2 wrenches 5mm hex head wrench 18mm dia. disc stylus 30mm star styli w/2mm ruby tips 1mm Ruby ball x 20mm stylus 1.5mm Ruby ball x 20mm stylus 2mm Ruby ball x 20mm stylus 2.5mm Ruby ball x 20mm stylus 3mm Ruby ball x 20mm stylus 4mm Ruby ball x 20mm stylus 30 degree point x 20mm stylus Cylinder x 20mm stylus M2 - M3 Thread Adapter M3 - M2 Thread Adapter 15mm Extension 20mm Extension Stylus Knuckle Wooden box