The run down adapter (RDA) is designed to provide consistent and reliable torque readings for use with power driven torque control tools. The RDA will reduce the impact and irregular peaks that cause poor repeatability. Each RDA has an effective torque range and will supply repeatable torque data within that range if used correctly. The run down adapter is mounted in-line between the tool drive and transducer. Operates in clockwise direction only. After each run down, the RDA should be completely backed-up. Compact size and lightweight. Model:RDA-50F Drive Size:3/8" Sq. Dr. Range: 6.8 - 67.8 N.m ,5 - 50 lbf.ft,0.7 - 6.9 kgf.m.