The threaded stem caster wheels are designed to replace old and broken wheels on desks, storage racks, chairs, lockers, shoe racks, bookshelves, and other furniture and widely used in homes, offices, libraries, bars, shops, etc.SpecificationColor: RedMaterial: Carbon Steel, PVCThread Size: M8*15mmTotal Load Capacity: 120 kg/ 264 Lbs, Per Load: 40 kg/ 88 LbsWheel Size: 50 x 22mm / 2 x 0.86 (Dia*W)Total Height: 84.2 mm/ 3.31 inch, 85 mm/ 3.34 inchMounting Height: 65 mm/ 2.56 inchThread Size: 8 x 15 mm/ 0.31 x 0.6 inch (Dia*L)Packing List: 2 x Threaded casters with Brake,2 x Threaded casters, 4 x M8 Nuts, 4 x Steel Wahsers(8x16x1mm), 1 x WrenchAdvantageThe caster wheels are made of PVC material, which has strong pressure resistance, wear resistance, easy to clean, does not damage the floor, is silent and has no noise rolling. Thickened carbon steel bracket, surface galvanized, rust-proof and durable.The wheel has built-in high-hardness balls and can rotate 360 degrees flexibly and smoothly. Locking brakes can hold the equipment firmly in place.InstructionThreaded design, equipped with flange nut gasket and wrench, making it easy to install on furniture to replace old casters. Suitable for smooth tile floors and rough cement floors. (NOTE: 2mm/0.08" thin spanner suitable for screw fixing nut installation)Note: 1. Please note that the load capacity of 4 wheels can only be calculated as the load capacity of 3 wheels. Because the road surface is uneven, the force on the 4 wheels may be uneven. 2. Please measure the size of the shelf bolt-hole before your purchase.