The Mountz Gedore 018200 RTU 450 (SILVER) Dynamic Torque Limiter, 1-4.5 N.m / 9-40 lbf.in, 3/8" Sq is used to convert conventional hand and power tools into torque limiting tools. Simply install the RTU to the end of a traditional power tool or hand tool to convert. Non-impact powered assembly applications can be performed quickly and accurately, including the tightening of bottles, caps and lids.