Upgraded Office Chair - High Performance Casters - Office Chair Replacement Part - Improves Strength. All-metal roll bar with high rise provides years of lightweight rolling and durability. The sturdy design (5-pack) can support 250 kg (weight). The wheel bar is strong and durable, and the design is more sturdy. Wide and thick double wheel structure, soft polyurethane material, pressure resistant, quiet and smooth, does not scratch the floor, does not leave marks on the surface. Each wheel uses four high quality ball bearings which are fashionable, comfortable, stable and quiet. Easy installation without tools or hardware. Just remove the old R and slide it into position. Spindle size is 11mm dia x 22mm (7/8") is compatible, connt for 99% of office chairs (without IKEA). Wheels give your chairs a more fashionable look and more comfortable, making you satisfied with office chairs or ordinary chairs. Wheels will be the best choice to upgrade your chairs.Features: Universal office chair pedestal with mounting holes - Double wheel design improves weight distribution and smooth operation - Easy to glide and swivel - 4 bearings - Maximum load: 250 kg - Soft rubber surface does not leave marks or natural and wooden floors, tiled floors, special floors and smooth concrete / asphalt floors - 2-step assembly process. Just take your old Roll and slide in your new ones, and you're set. Technical characteristics : Material: Steel and TPR rubber. Wheel diameter: 50mm - Width: 20 mm - Installation height: 57mm - Universal Fit: Rod size: 11mm x 22mm (not compatible with Ikea chairs 10mm x 22mm) - Colour: Black - Content: 5 office chair swivel casters.