Unique design. Just push the bike frame towards the arm head and it snaps shut locking itself to the frame. To release there is a handy lever lower down so removing your bike is easy. Features: Supplied fully assembled and ready to useno messing about. Can be used on either side of the vehicle. Quick and easy to attach to roof bars‘T’ adaptors are included if you need them. The 360° rotation of the arm head means it easier to attach in many different points and allows you to mount the bike facing either direction. The automatic locking system makes this ideal for carbon frame bikes. The arm system has an adjustable clutch mechanism to hold it in the right place whilst you load your bike. Works with 12” to 29” frames and frames from 22 to 50 mm diameter. Track in aluminium and the same in anti-scratch paint. Wheel holders have easy to use ratchet straps. Secure - locks bike to carrier and carrier to roof bar. Rubber protection at all contact pointsframe to grab armwheels to holders and carrier to bars. TUV/GS and ISO 11154:2006 (quasi static test) approval for bikes up to 20 kg.