HPL402 Rear Casters with Brake (pair, 4"), 222-6507Hoyer HPL402 Parts Rear Locking Casters w hardware The single caster wheel is no longer available and has been replaced with the 222 6507 part number. This is a pair of new caster wheels with brake and hardware. It is always recommended to change or replace both rear casters at the same time, so they wear evenly. This Rear Caster Kit is an easy install using included hardware. Makes everything down there nice and new!