Tenders for Supply of Cobalt Drill Bit, M42, Size: 4.50Mm Dia. Material & Specification -- Is: 5101 / Din-338 Warranty P Eriod: 30 Months After The Date Of Delivery Cobalt Drill Bit, M42, Size 4.0Mm, Is-5101/Din-388. Warranty Period: 30 Months After The Date Of Delivery