1/2 inch Imperial Hammer Drill Bit. Short transition from carbide tip to helix delivers higher drilling speed. Virtually trouble-free deep hole drilling thanks to rapid removal of dust and fragments. Carbide tip ruggedly embedded in the helix. Short transition between the drill bit head and flutes for fast drilling. Carbide tip securely embedded in the steel body. Drilling through-holes and penetrations in concrete and masonry in the plumbing, heating and air-conditioning systems installation trades.