The RS-12H has a special wide opening and is the largest available in its class in a 12” adjustable wrench. It is equipped with a hammer portion on the head of the wrench so as to not damage the moving jaw if used as a striking tool. The 7/8 box end portion of the RS-12H Wrench is used for pulling drill steel and accommodates nuts on 1”-3” Victaulic couplings. The RS-12H Hammer Head Miners Wrench can be used in various trades including, but not limited to, mining, forestry, automotive and construction. This wrenches meet all of the U.S. and Canadian specifications.