FIRSTINFO 3 PCS 150mm Thin Wall Safety Torque Limited Impact Socket 3 pcs thin wall saftey torque limited impact sockets Max. Torque: 17mm-100Nm / 19mm-100Nm / 21mm-110Nm The tightening torque is always lower than the safety value. The preset torque will decrease gradually and finally stable at about 25~35Nm. Square Drive : Dr. 1/2" ; Length : 150mm