I should mention that having used such bits with slotted screws for several years, they perform poorly compared to simple Phillips head screws with a properly sized driver bit. I think I still have one of my old collared bits but can't remember the last time I used it, more like a museum piece.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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