Crab Spacers 1.0mm thick (1-hole type x 4 pieces) [RC-KS110] Crab Spacers 0.5mm thick (1-hole type x 4 pieces) [RC-KS105] These aluminum crab spacers are perfect for adjusting the height of gearboxes, suspension mounts, and more! The crab claw-shaped open design and handle on the crab spacers allow for easy removal of the spacers by simply loosening the screws! You can easily change settings such as adjusting the height of gearboxes and suspension mounts, and adjusting the clearance of parts!