Friction Stay upvc Window Hinges Product 5/6 ← ↑ → Screw - Friction Window Hinge (pack of 20) Please Choose: Length select... 16mm 25mm £1.48 Ex VAT£1.78 Inc VAT Qty: larger image Friction Stay Screw Designed to screw into PVC and aluminium or mild steel reinforcing. They have a pan head which is designed to hold Friction hinges in place. The threaded shank is 3.9 mm wide. These are sold in packs of 20. The price is for one pack of 20. Model: SCWFST3.9 Manufactured by: Various