These screws are #8, 2.5 inches long, and use a T20 bit. 

No predrilling required as they have a specially designed cut point tip and serrated threads, which also prevent wood from splitting. These are designed for interior use and for MDF and hardwoods. 

The trim head allows for easy flush installation or countersunk. Approximately 154 screws per box. 

Zinc Coated.