General description Specifically designed to attach wood to light section steel (Max. 5mm), the TIMCO Self-Drilling Wing-Tip Steel to Timber Light Section A2 Stainless Steel Bi-Metal Screws are ideal for various construction and DIY projects. These screws feature a coarse self-tapping thread with wings that ream out the timber, allowing the screw to achieve maximum revolutions per minute (R.P.M.) without burning out. When the wings contact the metal, they break off to provide a secure fit. Technical specifications Material: A2 Stainless Steel Dimensions: 5.5 x 85 mm Maximum steel thickness: 5 mm