This is an optional Team Associated Blue 7.8x3.5x1.0mm Aluminum Hub Spacer Washer Set, intended for use with the RC8B3 and RC8T3 series vehicles for adjusting the wheelbase. Thicknesses range from .5mm, 1mm, and 2mm. Use these on any vehicle with 3.5mm hinge pins to tune the wheelbase. #31388
