There are 2 different types of hex screws: An Allen screw features a hexagonal indent in The top, necessitating an Allen wrench, and one other type has no indent within the hexagonal head and have to be used or eradicated having a socket wrench. You can find 5 differing kinds https://wood-screws00752.thechapblog.com/28163531/the-ultimate-guide-to-wood-screws