Constructed of 3/8 high strength steel with 4 lugs on each side to accommodate the DPMS and KAC barrel nuts. Works with any 3/8" or 1/2" drive torque wrench. The wrench was designed to accommodate DPMS barrel nuts that are a 24 hole pattern on a .845 Radius. The other side is for KAC or DPMS 22 hole pattern on a .845 Radius. Notes: This wrench will not remove DPMS Delta ring barrel nuts.