Headless suspension bolt: metal-to-wood bolt with Torx star point and hexagonal middle part for the screw wrench. Machine threaded body followed by a threaded wood screw tip. Self-tapping thread on one end, intended to be permanently screwed into a part, and a machine thread on the other end to accept a nut. INSTALLATION: 1) Pre-drill the runner into the surface. 2) Use a torx screwdriver to install the screw 3) Use a wrench for final adjustment. DIMENSIONS: Diameter M10, Length 100 mm, Wood 50 mm, Macine 40 mm, Key 8 mm, Torx 25 mm. ZINC PLATED: The suspension bolts are made of high quality zinc plated alloy steel. Durable and strong, perfect for indoor and outdoor use. Zinc coating adds extra protection and durability, while preventing rust formation for a long time. WIDE COMPATIBILITY: Compatible with concrete, brick walls, wooden constructions. Designed for wall and ceiling mounting. Suitable for TV shelves, pipe shelves, heaters, boilers, electrical wiring installation, provides a stud to secure a part using a nut.