Hymnorq 3/16 Inch Fractional Size M35 Cobalt Steel Extremely Heat Resistant Jobber Length Twist Drill Bit Set of 10pcs with Straight Shank for Repeated Drilling in Stainless Steel and Iron

COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit. SELF CENTERING - the 135°quick-cut splint point is self-centering and will penetrate quickly with less pressure. Will not "walk" or "wander" FOR STAINLESS STEEL - Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate. 10PC SET - The set includes 10pcs of 3/16" diameter M35 grade cobalt steel twist drill bits. Packed in a plastic case for easy storage and carrying. Manufactured to German DIN338 standard. DOWNLOADABLE USER GUIDE - We've summed up some tips of drilling metals, including a RPM chart for several common metals, based on our reviews and some articles on the internet. In most cases, our customers would get a much better result with these tips. Welcome to download.