• Made of high-resistance carbon steel with a galvanized finish to protect against corrosion and rust. • 104-piece set including 7 different sizes: M4x20mm, M4x30mm, M5x30mm, M5x45mm, M6x50mm, M6x60mm, and M8x50mm. • Double-ended screws designed with wood thread on one side and metric thread for metal or nut on the other. • Versatility for use in furniture manufacturing, carpentry, assembly of stairs, railings, and outdoor furniture. • Installation system that allows joining wood and metal structures in a stable and durable way. • Includes an organized plastic storage box for easy access and transport of the bolts.