45 SERIES CASTERS-MEDIUM DUTY 350-1,200 lb. Capacity. RWM’s 45 Series Casters are an economical version of our 46 Series Caster. Typical applications for our 45 Series Perfect Steerable Transfer Cartlude dollies, shop carts, scrap bins and floor trucks. The 45 Series Caster offers three brake options to best meet your requirements.