ITEM NAME:1 Nylon Plastic Carbon Steel Pulley Wheels Roller Groove Ball Bearing White JR Description 10pcs 5*21.5*7mm Nylon Plastic Carbon Steel Bearings Pulley Wheels Embedded Groove Specification: Model: 625ZZ Injection Material: White POM Bearing Material: High Carbon Steel Inner diameter: 5 (mm) Outside diameter: 21.5 (mm) Thickness: 7 (mm) Features: * High quality marterial, durable * Deep groove ball bearings, fashionable, slide flexible, * Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors and windows, shower pulleys and drawers, etc. Package included:.10pcs 5 21.5 7mm Nylon Plastic Carbon Steel Bearings Pulley Wheels Embedded Groove. Deep groove ball bearings, fashionable, slide flexible. 1 x Pulley Wheel. Bearing Material: High Carbon Steel. Injection Material: White POM.