General description Timco's heavy section self-drilling screws are specifically designed for use with heavy section 12mm steel. These screws feature a hex head and a self-drilling tip, allowing for easy installation without the need to pre-drill holes. Technical specifications Size: 5.5 x 50mm Quantity: 100 screws Material: Silver Ruspert plated for corrosion resistance Max steel thickness: 12mm Thread type: Fine self-tapping metric thread Usage These screws are ideal for attaching metal to heavy section steel, providing a reliable and durable fastening solution. Other information These screws have been tested to withstand over 1000 hours of salt spray testing, ensuring their durability in harsh environments.