1、With Deep Slot: Deep geometry slots guarantee firm supporting for radial, axial and high speed loads. 2、Stable Working: Metal shields on both sides will keep out unwanted wood dust and chips for stability. 3、Steel Material: Adopting steel material, these durable router bit bearing have a long service life. 4、5 Sets in Total: With 5 sets in total, satisfying all your needs for the replacement of damaged ones. 5、Easy to Install: Bottom mounted design with small size and light weight ensures convenient installation. 5 x Router Bit Bearing5 x Fixing Collar5 x Screw1 x Wrench Item Type: Router Bit BearingMaterial: SteelFunction: Steel bearing accessories suitable for router bits and tool holders. Bearing Outer Diameter: 1/2inBearing Inner Diameter: 1/4in