Colour:black Material:aluminum alloy Operation: step on the brakes. push down the knob on the Brake Lock. Release the foot brake and it's locked. To release the lock, step on the foot brake and it opens automatically. Install: Use two holes to mount the brake lock where is properly. In port (1/8 inch NPT): connect to master brake cylinder, it also come with 3/16 inch brake line fitting, you can chose to use the fitting or not. Out port (1/8 inch NPT): connect to rear brakes. , it also come with 3/16 inch brake line fitting., you can chose to use the fitting or not. Note: it should NOT be used under unintended, emergency or long time hold brake. Package Contents: 1 x Hydraulic Brake Park Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.