HSS Parallel Shank Drill Bit (High Cobalt) M42, as per IS:5101:1991, Size 4.2 mm(D) optimum drill bit tip type A/D optimum flute angle. Spec: BIS, IS 5101:1991 (Rev-1) Reaffirmed 2018, with latest revision and amendment.
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ASSAMPosted 29 Aug
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10 Sept 2026