Specification Brand : Unicatch BulletPoint : Star A5-Z8409 Retainer Back Chain BulletPoint1 : English System Stem Size: Our caster are standard 3/8" with 16 TPI,Coarse Thread (US), the stud diameter is 3/8" and the stud length is 0.79"(20mm), if your stem socket is Metric M10, this is incompatible, please check before buy. BulletPoint2 : 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. BulletPoint3 : 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. BulletPoint4 : 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 3/8” only. BulletPoint5 : Valued Purchase: Hirate package comes with set of 5 brake caster and few 3/8”-16 thread Nylon Lock Nuts. Color : Brake CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 0718725626992 ExternallyAssignedProductIdentifier2 : 718725626992 IncludedComponents : 5 Nylon Lock Nuts ItemName : 5/16" Grade 80 Alloy Chain half Drum 275' Working Load 4500 lbs. ItemPackageDimensions_Height : 20.8026 centimeters ItemPackageDimensions_Length : 10.8966 centimeters ItemPackageDimensions_Width : 13.1064 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : coil-chains LoadCapacity : 650.00 pounds LoadIndex : 800 Manufacturer : Unicatch Material : Soft Polyurethane Caster w/ Steel Bracket Material1 : Rubber Material2 : Cast Iron ModelNumber : 3" Caster , 3/8" x 0.79" - 16 MountingType : Stem Mount NumberOfItems : 1 PartNumber : 18068 ProductDescription : 5/16" Grade 80 Alloy Chain half Drum 275' Working Load 4500 lbs. ProductSiteLaunchDate : 2016-04-27T20:22:54.754Z Size : 3" Style : 3/8" Threaded Stem(English Unit) SupplierDeclaredDgHzRegulation : not_applicable SurfaceRecommendation : Multi-Surface UnitCount : 5