Colson 7 series swivel plate caster 7.10689.979.7 lh12.5 brk1 with brake 10″ dia. 3000 lb. Cap. single ball raceway kingpinless construction zinc plated chemically bonded non-marking tread on cast iron core for greater floor protection straight roller bearing in wheel zerked raceway & axle for easy maintenance tread lock brake standard top plate