Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation
Derived from renewable resources
also known as 'Gun nose taps'
Running below the optimum speed will cause chipping
Screw Extractor 10 Piece Set Nos 1-5 & Left Hand Stub Drills
16-60mm 11 Pce Tradesman's Hole Saw Kit with Bonus 12 Pc Jobber Drill Set Black finish tools are generally16 60mm 11 Piece Tradesman's Hole Saw Kit Tradesman's Hole Saw Kit 11 piece hole saw kit containing Cobalt Bi metal edge 1 piece saws with 48mm cutting depth.(16, 20, 22, 25, 32, 40, 51, 54, 60mm) Bordo bi metal hole saws are premium quality, general purpose saws suitable for a wide variety of materials and applications. The high speed steel cobalt (HSS Co) cutting edge provides shock resistant teeth and resists tooth strippage. 4 6 positive tooth