Regina 520 DR Series Drag Racing Chain 140 Links. Designed to withstand the severe application of drag racing. Plates, pins and rollers are shot-peened for improved fatigue resistance. Includes clip and rivet-type chain master links. DR Series Drag Racing Chain. Clip-Type & Rivet-Type Master Link. We guarantee your satisfaction, that's why our team works hard to get your gear to your door as fast as possible.