NEW 5-1/2 DTH Hammer Bit. The item “5-1/2 Down-The-Hole Hammer Bit QL50 Shank 12 Spline” is in sale since Wednesday, January 30, 2019. This item is in the category “Business & Industrial\Fuel & Energy\Oil & Gas\Drilling Equipment”. The seller is “drillingworld07″ and is located in Tracy, California. This item can be shipped worldwide.