This is the ST Racing CNC Aluminum Rear 1-Degree Toe-in A-Arm Set with Lock-Nut Hinge-Pins for the Drag Slash. Reduce the amount of rear toe-in from 3 degree stock to just 1 degree rear toe-in with these high quality CNC Machined aluminum rear A-arms. Reducing the rear toe-in will improve the straight line speed of your Drag Slash while at the same time beef up the rear suspension of your Drag Slash while adding great looks. Comes included with our heat-treated steel lock-nut style hinge-pin kit.