General description These TIMCO Self-Drilling Wing-Tip Steel to Timber Light Section A2 Stainless Steel Bi-Metal Screws are specifically designed for attaching wood to light section steel with a maximum thickness of 5mm. The screws feature a coarse self-tapping thread with wings that ream out the timber, allowing for optimal performance without burning out the screw. Technical specifications Dimensions: 5.5 x 65 mm Material: A2 Stainless Steel Type: Bi-Metal Screws Max steel thickness: 5 mm Usage Ideal for fastening wood to light section steel Wings break off upon contact with metal for effective drilling