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Step 12French Recess
Also called BNAE NFL22-070 after its Bureau de Normalisation de l'Aeronautique et de l'Espace standard number. Possibly a security screw drive system. Easily confused with a JIS or Frearson recess screw but with driver blades are modified into two step diameters.
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Jan 3, 2009. 8:15 AMberserk
says:
The bit in the picture in step 12 seems to be the same as the pozidriv bit in the next step... is that intentional?
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