These GPM wheel locks are engineered from 6061-T6 aluminium to provide a balance of light weight and robust durability for Traxxas Sledge Monster Truck use. The capped end limits sand and dust intrusion into the hub area while the knurled surface increases friction between the lock and wheel, producing a stable, repeatable clamp for both 1/8 4WD Sledge Monster Truck and 1/10 Electric 4WD E-Revo VXL Brushless applications.