New design composed of steel main shaft and aluminum body. The steel wire ring is secured to fix the screws in position preventing them from falling out. The aluminum shaft body is light in weight and strong, it helps to save the car battery and ensure higher standard of accuracy as compared to the complete steel design.The adjustable length is from 138mm to 148mm.Package includes : 2.5XM4X11 Screw Shaft - 4pcs ; 4X2.5 O-Ring - 4pcs.Will fit : Axial 1/10 SMT10 Grave Digger Monster Jam (AX90055)