Mast chock

Mast chocks in different thicknesses. This one on the left is the 8mm thick chock. Other standard thicknesses are 2mm and 4mm, allowing fine control of the mast position in the mast gate. The number representing the thickness is engraved into the chock so you can tell quickly which one it is. All chocks are 100mm wide across the top,  57.5mm wide below the top and 70mm deep (top to bottom).