Heavy-Duty Floor Lock 8 in For Caster Mounting Height 6 1/2 in Floor Lock Retracted Height 8 1/16 in Floor Lock Extended Height 6 in For Wheel Dia D Mounting Plate Bolt Hole Pattern 6 in x 4-1/2 in Mounting Plate Size Steel 2-1/2 in x 5 in Inside Bolt Hole Spacing 2-1/2 in x 5 in Outside Bolt Hole Spacing