The typical slotted head is ideal employed having a flat screwdriver, while the cross-formed indention is finest suited into a Phillips screwdriver. A Robertson screw features a sq.-formed indention and requires a matching driver head. Thread forming screws are comparable to thread chopping screws, but in lieu of removing material https://timcoscrews97418.nizarblog.com/28811429/getting-my-wood-screws-to-work