The SPAX stainless steel pan head screws are designed for use in various applications, including wood, plastic, and sheet metal. The screws are 4mm in diameter and 40mm in length, with a full thread and a T-star plus T20 4cut drive system. The pan head design allows for a wider surface area for bearing weight, while the stainless steel construction provides durability and resistance to corrosion. The package includes 200 pieces.