The ProMAXX PowerDrill 29-pc Drill Set is a drill bit kit with a variety of sizes. This set features precision ground points, flutes, clearance and drill diameters and a larger composition of cobalt to boost drilling capacity to an Rc55. Each bit is machine turned and ground for dead flatness, ensuring the bits won't "walk," according to the company. The sizes start at 1/16 to 1/2 by 64ths. This set is manufactured in the United States from American-made materials. The set includes free unlimited technical support.