General description The TIMco Wing Tip light section screw is engineered for securely attaching wood to light section steel, with a maximum thickness of 5mm. Its innovative design features 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 overheating. Upon contact with metal, the wings break off, enabling the thread to self-tap into the metal for a strong hold. Technical specifications Size: 5.5 x 50mm Box Quantity: 200 Colour/Plating: Zinc Head Type: Phillips Countersunk Bit Size: PH3 Other information Bright zinc electrolytic plating with a clear toxin-free finish.