General Purpose Floor Lock, 10 1/8 in For Caster Mounting Height, 9 1/2 in Floor Lock Retracted Height, 10 1/2 in Floor Lock Extended Height, 5 in For Wheel Dia., B Mounting Plate Bolt Hole Pattern, 3-15/16 in x 4-9/16 in Mounting Plate Size, Steel, 2-9/16 in x 3-1/4 in Inside Bolt Hole Spacing, 3 in x 3-5/8 in Outside Bolt Hole Spacing