English System Stem Size: Our caster are standard 5/16" with 18 TPI,Coarse Thread (US), the stud diameter is 5/16"-18UNC and the stud length is 0.79"(20mm), if your stem socket is Metric M8, this is not suitable, please check before buy.
3 inch Lockable Casters: Hirate caster constructed with brake pedal, it can brake the rotation of the caster only, but the stem is still moveable for direction.
Satisfaction Guarantee: The package comes with set of 5 caster and few 5/16"-18 Nylon Lock Nuts. Each caster will be backed by Hirate with lifetime warranty of replacement.
Heavy Duty Industrial Caster:Steel structures body is extremely hard wearing and resistant to dirt, 650 lbs capacity for 5 pack 3" swivel casters, can be widely used for most chairs and other furniture with Imperial Stem 5/16"-18UNC only.
Quiet & Smooth Roller: Made of high-tech elastic polyurethane, with internal bearings are quick rolling and the surface is sleek,wouldn't get stuck by crumbs,hair, wouldn't damage on floors.