Hitachi 728331 1-1/2-Inch By 18-Inch Hex Shank Wood Boring Spade Bit Designed to drill quickly and cleanly through all types of wood or composition board Highly engineered tip angles pull the bit into the wood ensuring a more precise hold at all angles heavy-duty hex shank is compatible with all 1/4-inch quick change systems DuraCore treatment strengthens the molecular structure of the metal for super strength Comes with a 30-day limited warranty The 1-1/2-Inch thick Hitachi 728331 has a length of 18-Inch and engineered tip angles for aggressive cutting speed with minimal tear out Hitachi DuraCore treated products are manufactured utilizing a proprietary technologically superior to cryogenic treatment This bit is ideal for contractors, serious do-it-yourselfers, machine shops, and mechanics Designed to drill quickly and cleanly through all types of wood or composition board Comes with a 30-day limited warranty