Tormek MSK-250 Stainless Steel Main Shaft and E-Z Lock Upgrade Kit (for T-7, Super Grind 2000 and all 10-Inch Tormek grinding systems) No tools required for mounting and dismounting the stone The special pitch on the left hand thread causes the rotation of the wheel to tighten the nut to the right torque Turn the Ezylock anticlockwise by hand and the grindstone will automatically tighten during the first sharpening. New design makes it very easy to change grindstones with no tools The shaft, washer and Ezylock are made of stainless steel.