Feature:1. Using high-quality 608ZZ bearing steel material, it has high and uniform hardness and wear resistance, and high elastic limit.2. The rollers are made of nylon coated materials, the cage has low vibration, low noise and high load-bearing capacity.3. Can be used for a long time in the temperature range of 40100, with low heat generation and stable performance.4. The pulley has a U-shaped groove, there is enough space to store grease, and the lubrication interval is longer.5. The nylon coated bearing cage is often used in motors, machine tools, gear drive shafts, pumps and construction machinery.Specification:Item Type: Roller BearingInner Diameter: Approx. 8mm / 0.3inOuter Diameter: Approx. 40mm / 1.6inWidth: Approx. 20.5mm / 0.8inSlot Width: Approx. 17mm / 0.7inGroove Depth: Approx. 5mm / 0.2inRadian Radius: Approx. 10mm / 0.4in(the above values are reference numbers, and the actual product shall prevail)Bearing Model: 608ZZ bearing steelPlastic Coating Material: Hardened nylonCoating Color: Black.Package List:10 x Roller Bearing