Description: 10 Pieces U-groove guide pulley bearings, groove deepness: 1mm Made from high quality carbon steel for durability Roll smoothly, high accuracy and low noise Great accessories for 3D printer extruder Also can be applied to other high-precision, high-speed equipment and instruments Specification: Outer Diameter : 13mm / 0.51" Inner Diameter : 4mm/ 0.16" U-groove Deepness : 1mm Package Includes: 10 Pieces U Groove Guide Pulley Bearing
