Neiko 02450A 1/2&rdquo; Drive Torque Limiting Extension Bar Set, Cr-Mo Steel | 5-Piece Set | 65 to 140 Ft-Lbs (90 to 190 Nm) Torque limiters are constructed of premium impact grade chrome molybdenum steel for heavy duty use with impact drivers Half-inch drive size is compatible with impact drivers to limit torque consistently and accurately to prevent lug nuts and fasteners from over-torquing Each stick is color-coded with engraved torque limit specifications for easy identification Male end features spring-loaded ball to secure sockets, and ball hole at drive end to lock onto impact tool drive tangs to prevent dropping during operation Set includes storage case and five 1/2-inch drive impact torque limiting extension bars ranging from 65 foot-pounds (90 Newton meters) to 140 foot-pounds (190 Nm) of torque