Chicago-Latrobe 550 - Cobalt Steel 115 Piece

Sizes in Set 116 12 x 64ths 1 60 A Z Number of Tools 115 Manufactured to NAS 907 Type J geometry aerospace specifications with selfcentering 135degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging and gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools performance is similar to uncoated tools Heavy duty construction for increased strength and rigidity compared to standard drill bits Cobalt steel tools are similar to highspeed steel but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys