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4 mm HSS Drilling | Drilling | Screwfix.comWe have a selection of HSS cobalt drill bits, HSS drill bit sets and HSS quick change bits. We have HSS drilling products from brands Titan, Erbauer, Bosch and DeWalt. | 1000's of products available in-store and online at low trade prices | FREE next day delivery available | FREE collection in 5 minutes | FREE Returns