29 Jan
2003
29 Jan
'03
7:10 a.m.
During my electrican days, we used screw heads like that to secure light
fixture covers in jail cells. They were the standard screw on jail rate
fixtures. Those fixtures used a welded frame with 1" thick lexan lenses.
James
`
I've also
seen some screw heads that have three tiny round holes, arranged
>in a triangular pattern.
I've never seen those or the tools to R/R them (and I have a BOX full of bits).
I'm guessing that they're proprietary to one company.
Joe