Tormek TOR-MSK200 Hardware Stainless Steel Main Shaft Bearings with E-Z Lock for T4 Sharpening System The special pitch on the left hand thread Turn the Ezylock anticlockwise by hand New design makes it very easy to change grindstones with no tools. The shaft, washer and ezylock are made of stainless steel Tormek E-Z lock upgrade kits fits T3, T4