Why Use a Pocket Hole Jig - Beginner Woodworking 101- what size screws to use for pocket holes ,10/7/2018· Save. A pocket hole jig is a useful tool for beginning and expert woodworkers alike. It is a versatile and dependable tool to use when you are building a project. I use mine all the time because it performs so well. The joints are strong and very easy to make. I have used the Kreg K4 jig as well as the Foreman, and both make my life so much easier.How to Choose the Correct Size Wood Screws27/3/2020· The correct size, length, and gauge of wood screws can be difficult to determine when building woodworking projects.Adding other factors such as the type of wood, screw material, lateral vs. sheer forces, and the presence of pilot holes only complicates the issue.