The gate attaches easily to the post with two insulated lag bolts (3") which are included. With the combination of features and patents it need not scratch or get caught in tractor lugs. In fact, as you bump into the gate, the gate "POPS" open and your vehicle is through before the gate swings shut. The gate always moves faster away from the vehicle than you drive into it. This is why it does not get caught in tractor lugs, or scratch vehicles side.