Hitachi superdrive W6VB3 screw gun for fastening subfloor. Roughly 15 years old but in great shape. Was used on 2 jobs, was 2 avg sized residential homes. The only fasteners I have for it is what's showing in the pic. Confirmed at Acme Tool you can purchase screws that take square bit. You would also need to purchase the square bit as I don't have any square bits.