Cowan Chuck is a drill chuck designed to fit the square rotor of an impact wrench. Now, an impact wrench can be used as a tool to drill materials such as concrete, cement, brick, stone, wood, etc. An impact wrench makes a great hammer drill. This new impact wrench type of drill utilizes the downward rotary hammer movement to drill more efficiently. The Cowan Chuck, made of steel, is a durable impact wrench accessory for a 1/2 inch impact wrench. The pneumatic impact wrench and 1/2 inch drill chuck combination stays cool on the job. It's air-cooled.