brocas de titanio para metal duro

STEP TARATOR BIT DRUM 9 STEPS (3-12mm) 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm Specifications: Material: High Speed Steel, Co (HSS co M35) Surface Treatment: Titanium Coated Hex Shank Diameter: 6.35mm/1/4" Hex Shank FEATURES: 100% brand new and high quality. co M35 high speed steel step drill, higher quality and more durable than HSS 4241 step drill. Automatically unblurs holes while drilling Spiral ribbed design gives it a faster, smoother cut Titanium nitride coating for the cooler that works Quick Change 1/4" Hex Shank These step drill bits are ideal for stainless steel, hard metal, plastics, wood, cast iron, copper, aluminum They also help enlarge existing holes Step bits are best used on thin materials. Since the one step drill bit can change to several different sizes, time is saved when using them with sheet metal work. Another purpose of stepped drill bits is to use them as counter dissipators. Another great use for step drill bits is in auto repair projects. 「USER INSTRUCTION」 1) Star drilling at low speed. Do not push too much. Let the drill bit cut by itself. The harder the material being worked with, the lower speed will apply. 2) Injecting coolant oil while working, it will dramatically increase drilling efficiency and extend drill life time. PACKAGE INCLUDED: 1pc 3mm-12mm Spiral Slotted Step Drill Bit