The three-sided geometry of Tekton High-Torque Black Oxide Screwdrivers directly engage the structure of your hand, instead of relying on friction with your skin, so you can apply high force with less fatigue. Round sections at the front and back ends of the handle allow you to spin long, finely threaded fasteners quickly and continuously. The overmolded grip provides a nonslip surface that is permanently bonded to the handle and won't degrade or become sticky over time. The polypropylene handle is reinforced with calcium carbonate for dimensional stability, making it resistant to extreme temperatures, gases, fuels, oils, grease, cleaners, and solvents. We use a molding process that forms the handle around the blade, rather than forcing the blade into a premade handle; the result is a straighter blade that can't twist out. The Phillips tips are truncated, allowing them to fully engage fasteners without bottoming out or slipping. Torx tips are made to Torx dimensional standards and torque specifications for optimal performance in Torx and star fasteners. The tips of the slotted drivers have a thick design that withstands high-torque driving and are machined to the same width as the shaft to fit into narrow recesses. This set includes low-profile rails to keep your screwdrivers organized in shallow drawers or on workbench surfaces.