This kit contains 5 of our most popular self-tapping screw sizes for pocket hole joinery. Use a 1 screw in 1/2 thick stock a 1-1/4 screw in 3/4 stock and a 2-1/2 screw in 1-1/2 stock. Self-tapping No. 2 square drive. Approximately 675 assorted screws. Self storing box. Pieces In Set: 675 Pcs. Warning: This product can expose you to chemicals including Formaldehyde which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov. -