Hirate 2.5" Caster Wheel with 5/16"-18UNC Threaded Stem Bolt-2 Casters with Brake Lock 3 Without- Heavy Duty Swivel Stem Casters Wheels Safe for Hardwood Tile Carpet Floor

A good caster will help you prevent costly floor repairs and forget the desk chair mats. And lockable casters let you prevent unwanted movements when you’re sitting, which is especially common (and annoying) on hard surfaces. Hirate Chair Casters with Brakes will meet your need. High quality polyurethane material will not to scratch or leave marks on any surface, protect your floor perfectly. There are 3 Standard Casters and 2 Casters with Locking Mechanism, you can fix your chair as you like! Features: ?2 PCS LOCKABLE CASTER WHEEL? -- SINGLE LOCKABLE: the brake locks the WHEELS ONLY and the swivel is still moveable. -- With brake, effective to stop and fix the device and prevent it moving to hurt others. ?HIGH QUALITY MATERIAL? -Made of high quality polyurethane, which is high mechanical strength, shock absorption and low-noise. ?SMOOTH & QUIET ROLLING? -Two precise bearings and soft polyurethane ensure that you can slide and glide around in total silence with these swivel casters. Specification: *Stem Type: IMPERIAL SIZE *Stem Diameter: 5/16" *Stud Length: 0.79"(20mm) *Wheel Type: Threaded Caster *Wheel Diameter: 2.5"(64mm) *Wheel Width:0.87" *Installing Height: 3.38" *Installing nut size: 5/16"-18x0.79" *Wheel Material: Polyurethane *Bracket: High quality steel - galvanizing *Double Bearing: Steel ball bearing *Total Load Capacity: 550 lbs/5pcs Package Contains: 2 x 2.5" Stem Casters Wheels with BRAKE 3 x 2.5" Standard Casters without brake WARNTING TIPS: THIS IS IMPERIAL STEM 5/16", NOT METRIC, PLEASE KINDLY CHECK YOURS BEFORE PURCHASE. Hirate Smooth Office Chair Casters-No Matter What Surface You Choose, It’s Like Roller Skating At Your Desk.