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Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. | 3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic. | This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes. | The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit. | 19Pcs 135 Degree Split Point Drill Bits Includes :1mm(length:3.4cm)\1.5mm\2mm\2.5mm\3mm\3.5mm\4mm\4.5mm\5mm(length:8.5cm)\5.5mm\6mm(length:9cm)\6.5mm\7mm\7.5mm\8mm(length:11.5cm)\8.5mm\9mm\9.5mm\10mm(length:13cm) [DIA 0.5mm Increments] .