Alpen premium grade HSS Cobalt drill bits are a premium grade high speed steel drill bit with a 5% Cobalt content blended into the steel during manufacturing..
The inclusion of Cobalt ensures that each drill bit is much stronger and harder wearing and also helps prevent fractures and increases torsion rigidity. Cobalt also assists with high heat resistance which leads to greater cutting capabilities. Ideal drill bit for both portable and machine drilling in ALL metals including bearing steels and stainless steel.
Sold as a single 4.5mm drill bit.
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