Toolzone 15 piece cobalt hss drill bit set perfect for drilling stainless steel sheet metal soft steels high alloy steels aluminium and non ferrous metals ground quality manufactured to din 338 standards 135 degrees split point grinding ensures perfect centring and reduced drilling pressure high heat resistance and improved wear resistance 5 cobalt size 15mm 2mm 25mm 3mm 4mm 45mm 5mm 55mm 6mm 65mm 7mm 8mm 9mm 10mm colour cobalt