Use on lightweight furniture, cribs, playpens, coffee and bedside tables. Plastic wheels roll on carpeted and hardwood floors. Swivels on acetal resin bearings. 40 and 50 Lb. load cap casters feature 5/16 in x 1-1/2 in stems. 60 Lb. load cap caster features 3/8 in x 1-1/2 in stem.