Specification Brand : MOLIGOU BulletPoint1 : Leveling casters are made of solid steel, bottom features durable and anti-vibration rubber foot pad to provide stability, and a wear-resistance nylon wheel ensures smooth rolling BulletPoint2 : Stem hole diameter is 12mm, caster height can be retractable from 3.4" to 3.7" BulletPoint3 : Easy to hold up 550 lbs per caster, 4 packs total 2200 lbs BulletPoint4 : Toggle switch to the left or right, then rotate the handle to raise or lower the rubber feet, retractable casters allows you to move the heavy table and adjust each caster independently to perfectly level your item even on the uneven surface BulletPoint5 : Support to heavy duty workbench, machine equipment, furniture counter, table saw, welding table, lathe stand and other heavy working machines Color : Black ExternallyAssignedProductIdentifier1 : 0691959306109 ExternallyAssignedProductIdentifier2 : 691959306109 IncludedComponents : 4 ItemName : MOLIGOU Leveling Stem Casters, Retractable Leveling Casters with Ratchet Handle, Heavy Duty Workbench Casters, Total Load Capacity 2200 Lbs, 4 Pack ItemPackageDimensions_Height : 8.26 inches ItemPackageDimensions_Length : 6.29 inches ItemPackageDimensions_Width : 3.93 inches ItemPackageQuantity : 4 ItemTypeKeyword : stem-casters LoadCapacity : 2200 Lbs Manufacturer : MOLIGOU Material : Steel Material1 : Polyurethane Material2 : Polyolefin Material3 : Steel MountingType : Stem Mount NumberOfItems : 4 PartNumber : 01 ProductDescription : Retractable leveling caster has a stable construction, it's designed for a long time use. You can rotate the handle to adjust the height of the caster, raise the feet to make it roll around, lower the feet to make it stay in place. Very convenient and practical for the heavy duty items like heavy workbench, welding table, table saw.