The pulley has a diameter of 90mm. Center hole diameter 10mm. Groove depth 10.8mm; Groove width 10.2mm. The wheels can accommodate up to 7mm rope or cable. The pulley wheel is made of a wear-resistant nylon housing with a 6202zz metal bearing inside. Durable, smooth and quiet material. Offers a maximum load limit of 220kg (500lbs). The pulley wheel is an ideal replacement roller for sliding windows, doors, garages, barns, weight machines, cable pulleys and any pulley lifting system. Black Weight: 300g