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ATORN 麻花钻 U4 HSSE，DIN 338，3.5 mm x 70 mm x 39 mm，118°
NO-GO thread ring gauge M50x1.5 6g left-hand thread
NO-GO thread ring gauge M18x0.75 6g, left-hand thread
AKASEL Aka-Ronan 3D steel disc with plastic coating 250 mm 2 pieces
NO-GO thread ring gauge M68x2 6g left-hand thread
NO-GO thread ring gauge M58x1 6g left-hand thread
NO-GO thread plug gauge M58x2 6H left-hand thread
NO-GO thread ring gauge M38x2 6g left-hand thread
NO-GO thread ring gauge M20x2 6g left-hand thread
Thread Plug Gauge M20x0.5 6G