These appear to be very good quality deck screws with a durable corrosion resistant coating. They are essentially T-20 Torx slotted pan head screws (not the T-15 listed in a comment). The bolt set includes a standard length T-20 Torx bit with a 1/4" hex head. The depth of the T-20 indentation (pocket) in the bolt head is standard for this type of fastener and allows for adequate Torx bit engagement Bits As long as the torx bit is held in line and at right angles to the screw as it is screwed in, there is absolutely no problem with the bit coming out, loosening, or exposing the torx notch... even if the screws are removed and Can be reused I've already used about half of 1 box and not a single screw is broken, bent or loose. Good closure. Would buy again.
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