General description Timco's heavy section self-drilling screws are specifically designed for heavy section 12mm steel applications. 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 55mm Washer size: 16mm Quantity: 100 screws Thread type: Fine self-tapping metric thread Other information Coating: Silver Ruspert, providing a durable corrosion-resistant finish Salt spray resistance: Over 1000 hours Designed to meet recognized industry standards and performance criteria