ITEM NAME:8*30*9mm Nylon Plastic Embedded 608 U Groove Ball Bearing Guide Pulley OZ Specification: Brand new Color: white Injection Material: POM Bearing Material: high carbon steel Inner Diameter: approx.8mm/0.3" Outer Diameter: approx.30mm/1.2" Thickness: approx.10mm/0.4" Groove Depth: approx.2.5mm/0.1" Groove Width: approx.5mm/0.2" Feature: Light weight and durable. Slide flexible, wear small. Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors and windows, shower pulleys and drawers, etc. Package included: 1pcs x Ball Bearings Guide Pulley.1pcs x Ball Bearings Guide Pulley. Groove Depth: approx.2.5mm/0.1". Groove Width: approx.5mm/0.2". Bearing Material: high carbon steel. Slide flexible, wear small. Light weight and durable.