This product is a pack of 200 stainless steel screws with a flat countersunk head, size 4 x 40mm, and partial thread. The screws have a T-star plus T20-4Cut drive system for easier installation and a cut point tip for better precision. They are made of A2 stainless steel, making them suitable for use in outdoor and damp environments as they are corrosion-resistant. The screws are ideal for wood-to-wood connections in furniture making, decking, and other outdoor construction projects.