• Double-threaded M8x100mm screws made of high-quality carbon steel, resistant to scratches, corrosion, and with high strength and durability. • Double-head design: one end with self-tapping thread for easy screwing into parts and the other end with machine thread for installing nuts. • Mechanical thread with Torx design on one end and drill bit included, ideal for connecting wooden parts. • Easy to install and use, with clean and clear threads, well-made, easy to tighten, and non-slip. • Suitable for concrete, brick walls, wooden structures, TV brackets, pipe shelves, iron furniture, outdoor furniture, home furniture, stair columns, wooden railings, solid wood furniture, and DIY projects. • The package includes 20 Torx suspension bolts and 1 drill bit.