Name: 4 set Ultimaker 2 Sliding Block Injection Slider With Graphite Copper Sleeve + Spring clip.
Inner Diameter x Outter Diameter x Length: 8*11*30mm.
Application: Fit in Cross shaft 6mm, Transmission shaft 8mm Of Ultimaker 3D Printer.
Feature of Graphite copper sleeves:
Graphite copper sleeves are less friction force and smoother than common copper sleeves.