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7 1/2" diameter rock tooth pilot bit. Comes with 2 TX56 (29225) and 2 TX58 (29400) teeth which are the same as the auger uses. This cast head digger derrick rock auger pilot bit bolts directly to the boring head with no adapter needed. This will replace the standard fish tail bit but drill rock much better. You can also put the carbide TXD teeth in it later if you want.
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