This is a pair of Pro-Line SC10 12mm Wheel Adapters, and are intended for use on the rear of the SC10 short course truck. Are you tired of stripping the drive pin slot in your rear SC10 wheels? Look no more, Pro-Line has you covered with the release of the 12mm Wheel Adapters for SC10! Now you have the option of running Pro-Line popular ProTrac™ offset wheels with durable 12mm hex drives. These hex adapters are made from durable anodized aluminum so you can rest assured that they will stand up to the power of your SC10.