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, making them ideal for attaching metal to heavy section steel without the need for pre-drilling. Technical specifications Size: 5.5 x 65mm Washer size: 16mm Quantity: 100 Thread type: Fine self-tapping metric thread Other information Coating: Silver Ruspert, providing durable corrosion resistance Salt spray resistance: Over 1000 hours Manufactured to meet recognized industry standards and performance criteria