... , moldon PU, Semi steel, nylon, Phenolic, V-groove caster, etc. Product: Total Lock Heavy Duty CasterFEATURES:Finish Bright Zinc platingTop plate and yoke ... steel plate,brake--use 4mm steel plateResists Oil, Swivel: full double ball bearing,Axle--1/2" diameter boltLocking maechanism-step down the pedal ... contact us if you are interested in it. Total Lock Heavy Duty Casters