The PROLOK range of TRI-LOBULAR Screws is one of the most popular security screws - Tri-angular drive recess for security.
The hardened steel threadforming screw, with the correct size pilot hole, can tap their own thread into steel up to 10mm thick.
Driver Tools (check item description for code of tool):
TL2 - for use with T17, Self-Drilling & Thread-Forming screws
TL10 - for use with machine screws