Engineered for heavy duty work, BLITZ BITS are high performance drills for production as well as tough maintenance applications. Made from a premium grade of M-7 molybdenum high-speed steel, which has a special black and gold surface treatment to increase lubricity and reduce friction. The strong web construction provides greater strength and rigidity to drill in hard-to-drill materials like stainless steel and titanium alloys. Silver and Deming drills are ideal for portable drilling and drill presses, where the maximum chuck capacity in 1/2 inch. Buttressed cutting edge, with acute rake, makes the BLITZ BIT cut cleanly and accurately with less effort. The extra clearance behind the side margin reduces friction, enabling balanced cutting action with closer hole tolerances at higher speeds.