Chipboard Countersunk Screws Are Coarse Thread Screws Made From Carbon Steel Or Stainless Steel. *Created To Fasten Low Medium And High Density Chipboard And Are Often Used For Cabinetry And General Woodworking. *Hardened To Prevent Breakage And Sharp To Ensure Easy Penetration Into Wood. *Nibs Under The Head For Countersinking And Grip. *Used In Conjunction With High Quality Bits. **Sizes Available: *Cbc Square Zp No6 3.5mmx16mm *Cbc Square No6 3.5mmx30mm *Cbc Square No6 3.5mmx40mm *Cbc Square Zp No8 4.2mmx16mm *Cbc Square No8 4.2mmx30mm *Cbc Square No8 4.2mmx40mm *Cbc Square No8 4.2mmx50mm *Cbc Square No8 4.2mmx60mm *Cbc Square No8 4.2mmx70mm *Cbc Square No10 5.0mmx75mm