General description The M12 50 x 70 mm Steel Roller Bearing is designed for use as an electric door top wheel, placement door nylon flange wheel, iron door wheel, electric door wheel guide, track wheel, and pulley. It is made of durable PP steel and features two 6201ZZ bearings, making it a great replacement for old or damaged bearings. Technical specifications Dimensions: 50 x 70 mm Material: PP steel Bearing type: 6201ZZ Quantity: 2 pcs