Robust: 40mm diameter, Base plate dimensions 46 x 39.5 mm overall height 52 mm Please note that there may be an error of 13mm in manual measurement Pack quantity: 4 wheels (two with brakes, two without brakes) 2 castors with brakes + 2 castors without brakes, lockable castors. Flat rollers are rollers without a pin. 16 screws. Robust: 40 mm diameter, base plate size 46 x 39.5 mm, overall height 52 mm. These durable casters can be used for items of all sizes, with a total load capacity of 88kg over 4 casters. Including mobile furniture, dressers, refrigerators, air conditioners, tables, etc. Quiet - The upper and lower raceways are equipped with high-quality slewing bearings. This bike runs smooth, fast and quiet. The wheels can be rotated 360 degrees and roll smoothly in all directions. Floor-friendly: no damage to the floor. These soft rubber wheels will extend the life of your floor or carpet. Your floors will be free of scratches and your carpets will be free of wear and tear. Casters with brakes allow easy movement on any surface. No damage to the floor from friction These casters are used as heavy duty casters for furniture trays and industrial areas. Wheels with brakes are versatile and can also be used as wheels for beach chairs or outdoor umbrella stands.