This kit contains five of Kreg's most popular self-tapping screw sizes for Pocket-Screw Joinery, all in a durable and easy-to-carry case. All Kreg screws feature a deep No. 2 square drive, a needlepoint self-tapping tip, and a hard plastic case built for strength. The kit comes complete with 150 count each of SPS-F1, SPS-C1, SML-F125, and SML-C125 screws as well as 75 count of SML-C250B screws.