Hss Drill Parallel Shank Supper Jobber Drill Size: 3.8 Mm Dia As Per Is : 5101-1991 M35 (Hss With 5 Percent Cobalt & 63-66 Hr C) Make J.K.Files & Tools Or Miranda Or Addison Only. [ Warranty Period: 30 Months After The Date Of Delivery ] ]