You can find a substantial amount of idea with regards to the thread of screws which we is not going to go into to below, but you will discover a superb thorough description here on Wikipedia. The big edge is that it's going to help save you time as there isn't a need to drill a pilot gap and they are alleged to hold two different resources alongs

Cam-out refers to a tad that slips out with the screw head. Basically, For anyone who is trying to tighten a screw, the the screwdriver tip keeps slipping out on the screw head, you’ve skilled a cam-out. An external Torx screw includes a projecting head in The form of a Torx screwdriver bit (in lieu of an ordinary recessed cavity); a Torx socket