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These are the ends from the coil core material I use. They range from 3 to 5 inches. If you want to make your own coil cores and need the right material, these are for you. Most of them have cross hatch knurling on one end. I only have 5/16" dia. right now but 3/8" is coming soon. This core material makes for good, strong coils that do not heat up if you insulate them correctly and use the right wire. Sizes vary, if there are short pieces, I will throw in an extra piece so you get the most out of your order. The 12" length is $3.50 even though it says $4.50 when you choose it.
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