Torx Drive Flat Head Thread Cutting (Floorboard) Screws - Type F / Black Phosphate and Oil. Hardened Steel.
Torx® is a registered trademark name for a special type of screw or bolt head drive. Torx drives have a 6 point star shaped recessed drive which requires specialized bits or tools. The Torx drive was created to reduce slippage and stripping (cam-out) of fastener heads during tightening and loosening. Other popular screws include: machine screws, sheet metal screws and wood screws.