The KTSB15 is a double-fluted, high-speed step drill bit capable of drilling three hole sizes: 7/8-inch (22.2 mm), 1-1/8-inch (28.6 mm), and 1-3/8-inch (34.9 mm). It features two flutes for faster cutting and cooler operation, a fast-starting non-walking drill tip for accuracy, and easy-to-read silver step rings for quick size identification. A thick, extra-long 3/8-inch hex shank provides a firm, positive grip in the drill and prevents spin-out. This makes it an efficient tool for applications requiring multiple common hole diameters without frequent bit changes.