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.