Heavy-Duty Adjustable-Height Floor Lock 8 1/4 in to 11 1/2 in For Caster Mounting Height 6 3/8 in Floor Lock Retracted Height 11 1/2 in Floor Lock Extended Height 6 in 8 in For Wheel Dia M Mounting Plate Bolt Hole Pattern 4-1/2 in x 6-1/2 in Mounting Plate Size Steel 3-3/8 in x 5-1/4 in Inside Bolt Hole Spacing 3 in x 3 in Outside Bolt Hole Spacing