There are 2 different types of hex screws: An Allen screw includes a hexagonal indent in The top, necessitating an Allen wrench, and the opposite type has no indent inside the hexagonal head and need to be applied or taken out that has a socket wrench. Elevator bolts are Utilized https://timcoscrews97529.tkzblog.com/28560323/the-fact-about-wood-screws-that-no-one-is-suggesting