Abrasion-Resistant Nonmarking Floor Lock 8 5/16 in For Caster Mounting Height 8 5/16 in Floor Lock Retracted Height 9 7/16 in Floor Lock Extended Height 8 in For Wheel Dia B Mounting Plate Bolt Hole Pattern 3-15/16 in x 4-1/2 in Mounting Plate Size Steel 2-9/16 in x 3-3/16 in Inside Bolt Hole Spacing 3-1/16 in x 3-11/16 in Outside Bolt Hole Spacing