General Purpose Floor Lock, 6 11/16 in For Caster Mounting Height, 6 11/16 in Floor Lock Retracted Height, 8 3/16 in Floor Lock Extended Height, 6 in For Wheel Dia., C Mounting Plate Bolt Hole Pattern, 5-5/16 in x 5-1/2 in Mounting Plate Size, Steel, 2-15/16 in x 4-1/8 in Inside Bolt Hole Spacing, 3-5/32 in x 4-9/64 in Outside Bolt Hole Spacing.