The Holder Bike Holder 4 arm secures the 4thbike to the 3rd bike on the bike rack. The removable rack protects your bikes from theft thanks to its locking nut. The Thule AcuTight system allows for easy attachment; a click is heard when the optimal tightening is reached. For ThuleSport G2, Thule Excellent & Thule Elite G2bike racks. Colour: silver grey Length: 15 cm. Delivered with knob and keys.