直柄超长麻花钻

直柄超长麻花钻（GB/T6135.5-1996）（mm）
dh8	L1=125 l2=180	规格L=160 l1=100	规格L=200 l1=150	规格L=250 l1=200	规格L=315 l1=250	规格L=400 l1=300
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