Rowing Machine Bearing Wheel Trainer Gear Attachments 4x for Home Fitness Exercise 4x Rowing Machine Bearing Wheel Trainer Gear Attachments For Fitness WorkoutBearing pulley wheel made of high quality steel, rustproof and wear resistant.High hardness and excellent wear resistance, durable to use. Low noise, stable performance, and high load capacity.Suitable for rowing machine, universal accessory for most gym equipment.Size: 42.1mm outside diameter, 8.1mm inside diameter.Size Chart:Inner Dia: 8.1mmOuter Dia: 42.1mm/1.66inchPackage Includes:4 Replacement Roller Wheel Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!