TKR6850 M6 Driveshafts/Joint/Pin Fr/Re Slash 4x4 Tekno axles, joints and pins for the Tekno RC M6 Driveshafts. CNC machined from steel, then hardened for durability. These will work for the front or rear end of your Slash 4x4. These must be used in conjunction with the M6 Stub Axles (TKR6853).