Slotted (flat or straight) Phillips (“crosshead”) PH Pozidriv (SupaDriv) PZ Square Robertson (square) Hex Hex socket (Allen) Torx T & TX Security Torx TS Tri-Wing Torq-set Spanner head (Snake-eye) Triple square XZN Polydrive One-way Spline drive Double hex Bristol From Wikipedia’s series on screw drive types, which is, thankfully, an actual topic.  These are like … Continue reading Screw drive types