Countersunk PH2 head drill point screws for affixing window and door hardware into reinforced upvc, such as for espags, shootbolts, keeps and door locks. Available in 3.9mm,4.8mm and M4. The M4 csk drill point screws are generally used for thicker steel reinforcing plus applications with multi chambered profile sections to avoid “jacking up”. Carbon steel screws zinc plated to BS7412. Packed in biodegradable boxes.