ITEM NAME:6Pcs/Set Parallel Manipulator Fisheye Carbon Rod Kits For M3 20Cm Screws Ko Y9Y5 6Pcs/Set Parallel Manipulator Fisheye Carbon Rod Kits For M3 20Cm Screws Ko Y9Y5 these rods and bearing are durable. Specially designed for Kossel 3D printer, great replacement for your old or broken ones. M3 screw is used in knuckle bearing. The whole set has six parallel manipulator, Use the professional metal mold to ensure the distance between the two center of fish eye is same. colour:black Material:Metal + plastic size:20cm 6*20cm (M3 screw hole) the OD of the carbon fiber rod is :5mm the ID is :3mm Package Contents: 6 x Parallel Manipulator Fisheye Carbon Rod.The whole set has six parallel manipulator. 6 x Parallel Manipulator Fisheye Carbon Rod. size:20cm 6 20cm (M3 screw hole). M3 screw is used in knuckle bearing. the OD of the carbon fiber rod is :5mm.