What is this?
What is this tool used for? it seems to be a stainless tool steel and has a round shaft with a triangle tip.
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Some type of punch. Another picture of the tip/end might help. Right now it looks kind of flat.– crip659Commented Dec 13, 2022 at 21:13
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the tip is flat, possibly looks like something has snapped off it.– sammckayCommented Dec 13, 2022 at 21:29
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New pictures help. Looks like a grounded edge(abused), so maybe a chisel/punch.– crip659Commented Dec 13, 2022 at 21:37
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2An end mill someone abused as a punch. Google brenco and you get "Lathes + Machine Tool Archive"– MazuraCommented Dec 14, 2022 at 0:49
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2someone has been using it as a punch (because the other end is mushrooming) but I don't think that was the original purpose.– JasenCommented Dec 14, 2022 at 1:32
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1 Answer
It's a VERY limited use security bit, for screws generally used to secure wall panels in private spaces prone to vandalism. (I've mostly seen them in boy's bathrooms in schools). It's often called a tri-star bit.
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it seems kind of flat faced, tri star is not particularly obscure.– JasenCommented Dec 14, 2022 at 1:46
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2This was my initial thought, but... it's got a round shank, not hex, so it won't fit an impact driver (where 99% of bits are meant to go these days). There aren't any scratch marks on the shank from having been tightened down into a normal 3-jaw chuck (if it's much older). It's quite rather long to be a driver bit. OP believes it to be stainless steel which is rather uncommon for use as tool steel - it's too brittle.– FreeManCommented Dec 14, 2022 at 17:24