LOCKING BRAKE: Four rubberized casters included, two of which come with lever brakes; rubber feet on bottom for nonslip stability keep it from slipping SUPERIOR QUALITY: High quality stainless stand, enhanced steel column and plate enables four caster wheels to withstand up to 500 lbs NOISE-FREE ROLLING: With polyurethane, these wheels makes movement easy and noiseless; The castors will glide smoothly and not scratch your hard wood floors VERSATILE APPLICATION: Perfect caster system for studio rack cases, home furniture and more