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