Floor Lock, 9 3/8 in For Caster Mounting Height, 9 3/8 in Floor Lock Retracted Height, 9 3/4 in Floor Lock Extended Height, 8 in For Wheel Dia., B Mounting Plate Bolt Hole Pattern, 4 in x 4-1/2 in Mounting Plate Size, Steel, 3 in x 3 in Inside Bolt Hole Spacing, 2-5/8 in x 3-5/8 in Outside Bolt Hole Spacing