Screws and Accessories Product 10/11 ← ↑ → Screw - Self Drilling For Metal Reinforcing (pack of 20) Please Choose: Length select... 16mm 19mm 25mm 32mm 38mm £1.48 Ex VAT£1.78 Inc VAT Qty: larger image larger image Designed to screw into aluminium and mild steel reinforcing, the threaded shank is 3.9 mm wide (picture above). These are sold in packs of 20. The price is for one pack of 20. Model: WW-SCWDR3.9 Manufactured by: Various