General Purpose Floor Lock 5 5/8 in For Caster Mounting Height 4 7/8 in Floor Lock Retracted Height 6 in Floor Lock Extended Height 4 in For Wheel Dia B Mounting Plate Bolt Hole Pattern 4 in x 4-1/2 in Mounting Plate Size Steel 2-5/8 in x 3-5/8 in Inside Bolt Hole Spacing 3 in x 3 in Outside Bolt Hole Spacing