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I’m looking for a 5/16″ diameter drill bit 24″ or longer. Any sources? TIA
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Home Depot had some on sale with the yellow tags-still on sale I think. They are Greenlee electricians flexible bits anout 5'. About $12 marked down & another 40% off that I think. You can also just buy some 1/4' drill rod & weld whatever bit you have on the end. Comes in 3' lengths, pretty cheap. Good for lots of things. Joe H
*Any respectable Electric supply will have the bits that joe described available. Mr T
*Don't see too many 5/16", lots of 1/4 and 3/8, but rarely 5/16 longer than 18".
*Sometimes these are called "Bell hanger's bits." That might help your searching.
*Have done 4 ft. bits like this - Cut a notch in an angle iron as alignment tool, buy a piece of 5/16 drill rod (or even mild steel rod), weld & anneal joint to jobber bit. Brazing works if ends are turned to 30 degree male/female cones. If your alignment isn't perfect, straighten on anvil or run drill slow.
*Greenlee and several other electrical supply manufacturers make long, thin shafted bits in several tip configurations. Wood, wood/ light metal and masonry are available in a variety of sizes 1/4" to 5/8" commonly. The flexable shafts are about 3/16" diam and come in 4 and 6' lengths. "Flex-bit" is one brand.A person, with just a bit of practice and luck, can while working through a 2 by 3" hole shoot blind sidways through several studs to the length of the bit and remain in the stud bay. These things can be real life savers.Used to be only electrical supliers carried these things but lately I have seen them in the larger home centers with the electricians tools.