Drag Bit: rag Bits For Water Well Drilling A drag bit is a drill bit usually designed for use in soft formations such as sand, clay, or some soft rock. However, they will not work well in coarse gravel or hard rock formations. Uses include drilling water wells, mining, geothermal, environmental and exploration drilling. Whenever possible, they should be used to drill pilot holes because they produce cuttings that are easiest to log. Product Specifications ->Select tungsten carbide inserts 3/16" thick are standard ->Carbide inserts are individually hand soldered using nickel silver rod ->Bits fabricated are welded with high tensile strength 7018 rod ->Drag bits are welded solid at the nose for durability ->Blades originate from 4140 heat-treated tool steel forgings ->Forgings are milled to better seat the carbide inserts ->Relief is hand ground behind carbide inserts for maximum performance ->Bits can be built to the gauge tolerances required