MALLLALA,3"caster wheels with 3/8" X 0.79"-16TPI coarse thread (US),the stud diameter is 3/8",the stud length is 0.79",no noise rubber wheel,protect floors from damage,heavy duty threaded stem caster replacement for office most chairs,also be used for DIY furnitures,projects etc.,set of 5 with safety dual brakes Product Description: Encased with soft Polyurethane,bracket made by 2mm thick industrial steel,double bearings structure,helped these parameter,our caster wheels transform your office chairs/projects into stylish modern furniture instantly.these swivel castors glide across any floor smoothly and quietly.they will not mark up your floors,so you no need to use chair mats any more.brake pedal mechanism,when applying the brake,keep these in place firmly and stably Product Specifications Item: Caster Wheel Color: Black Material: Polyurethane,Steel Model Numbe: 3" Wheel,3/8" X 0.79"-16 Stud Special Features: Set of 5 Wheels with brake Number Of Items: 5 Mounting Type: Threaeded Stem Load Capacity: 650 Pounds Wheel Diameter: 3 Inch Threaded Stud Diameter: 3/8" Threaded Stud Length: 0.79" Measurement System: English Included Components: 5 X 3/8"-16 Nuts,1 X Wrench Product Feature ?Silent & Smooth Rolling; ?Heavy Duty Capacity Load; ?No Damage To Floors; ?Easy To Install; ?Dual Brake Feature; ?Long Lifespan; Package Details( We Offer 4 Kinds Of Nuts For Your Option ) 5 X 3” Caster Wheels with brake 5 X 3/8" Threaded Screw Inserts / Flanger Nuts / Nylon Nuts / Hex Nuts 1 X Wrench Note The Threaded Stem Is 3/8" * 0.79"-16, Its Measurement System Is English,Not Metric.