Tekton Hard Handle Screwdrivers are made of durable glass-reinforced nylon and are resistant to extreme temperatures, high impacts, chips, cracks, scratches, fuels, grease, and solvents. The handle is refined from a classic square profile and has comfortable contours along the sides that create natural positions for your fingers. 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. 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.