HPMAISON True 5% Cobalt Jobber Drill Bit Set, 10Pcs 4mm M35 High Speed Steel Twist Bits, 135 Split Point Extremely Heat Resistant for Stainless Steel, Cast Iron, Hard Metal, Plastic, Wood

【PROFESSIONAL AND WIDE USE】M35 drill bits made of high-speed steel (HSS) with 5% cobalt, ideal for drilling stainless steel and hard steels. Can also be used for drilling metals and other materials, such as cast iron, copper, high temperature alloys, titanium alloys, aluminium, hard plastics and woods, etc 【High-quality material】 M35 high-speed steel (HSS) with 5% cobalt. Strong and durable for durability Suitable for drilling applications of particularly strong or hard metals such as stainless steel, Cr-Ni and special acid-resistant steels 【Maximum Heat Resistance】HPMAISON M35 HSS Cobalt Twist Drill Bits should be used and operated at 1500 rpm or more for maximum efficiency. Straight shank allows for firm grip and accurate centering, suitable for standard chucks and regular round collet chucks 【Helical Design & Performance】 Precise 135° split tip, gold oxide finish and straight round shanks. Manufactured to DIN338, they prevent lateral displacement and remove chips and particles more quickly. Manufactured with complete precision grinding that ensures smooth chip movement 【Easy to Use & Storage】10pcs M35 Cobalt Steel Work Twist Drill Bit Set - 4mm Drill Bit Diameter, 43mm Groove Length, 75mm Total Length. 10 pieces packed in a plastic box for easy use and storage