Sure-Grip DA45 Double Action Trucks! Double action, 45 degree trucks with standard 8mm axles that offer incredible maneuverability. Adjustable pivot allows you to align the pivot to the pivot cup perfectly! These trucks were designed for roller derby and are ultra-responsive, lightweight, and durable. Sold individually (4 trucks required for complete set of roller skates). Compatible with all Sure-Grip 45 degree action plates such as the Avenger, Invader or XK4.