Apex slotted screwdriver bits . Slotted screwdriver bits have a single slot in the fastener head and the tool used to drive a slot is called a slot-head, flat-tip, or flat head. Apex Bits offers a wide selection of Apex Slotted screwdriver bits, which are commonly used in aircraft assembly, maintenance and throughout the aviation industry. This Apex Slotted Bit can be used for driving screws and fasteners with hand tools, corded or cordless power tools, and pneumatic tools.