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NO-GO thread ring gauge M78x2 6g left-hand thread
NO-GO thread ring gauge M24x0.75 6g, left-hand thread
NO-GO thread ring gauge M48x3 6g left-hand thread
PRESSOL
NO-GO thread ring gauge M21x1 6g left-hand thread
NO-GO thread ring gauge M27x2 6g left-hand thread
NO-GO thread ring gauge M30x3 6g left-hand thread
LEITECH Thread insert M 15 x 1.5 - 6H no go
Thread plug gauge EG M8x1 6H mod
ATORN 麻花钻 VA HSSE，DIN 338，4.4 mm x 80 mm x 47 mm，130°