Drill Service (Horley) Ltd Contact sales on sales@drill-service.co.uk or call +44 (0)1293774911 DCOLSSTEP - Long Series HSCO 90 Degree Step DrillsHSCo Cobalt 90° Long Series Step Drills. Designed for deep borings or those in places that are hard to reach, for installing aluminium section bars, metal trim, traditional woodwork trim. HSS-E Cobalt = hardness 65 HRC, to machine steels up to 1000 N/mm², cast iron up to 180 HB, copper, brass, bronze, aluminium.
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