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1, many kinds of differernt auger adapter
2, type : 140-CS ,140-S ,141-M ,141-M, and so on.
3, material in 42CrMo , heat treatment HRC around 45 , welded to augers .
4, assemble with SB bits with hexagon bots and nuts.
5, surface : blank.
6, original in Ningbo ,China