Reviews Heavy duty Cobalt Pilot Counterbore

Qualtech 1-1/2\ HSS 4MT Taper Shank Drill Bit, DWDTS1-1/2

Cobalt taper shank drills are made of heat resistant cobalt..
Engineered with heavy-duty construction to perform well in tough, hard-to-machine materials..
Morse taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters.
When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging.
Designed to perform in a broad range of materials in the iron and steel families.

All-in-one kit – features two SpinLOCK Universal arbors, steel pilot bit and six hole saws with Progressor tooth design.
SpinLOCK universal arbor – fits all brands and sizes to simplify diameter changes with fast plug removal and tool-free install.
The pilot bit – designed to start holes in a variety of materials.
Progressor tooth design – hole saws feature alternating teeth size for performance, cutting faster and lasting longer in wood, metal and plastic materials.
Durable hole saw material – hole saws are made with 8% cobalt alloy.

Set includes 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64" and 1/2" cobalt drill bits.
Century Pro Grade drills are made from 5% industrial quality M35 cobalt alloy high speed steel..
Cobalt is extremely heat resistant, when used and operated in power units that have a RPM speed of 1,500 or more for maximum efficiency..
Lasts up to 12 times longer than the average consumer-grade high speed steel drill..
135 degree quick-cut point penetrates faster and will not walk or wander at the starting surface. Does not require a center punch or pilot hole..

✔ PREMIUM 35 PCS SCREW EXTRACTOR SET - (16) left hand cobalt drill bits (5/64" - 1/2"), (13) multi-spline screw extractor (1/8" - 1/2") and (6) spiral screw extractors (#1 - #6). Ideal for removing stripped , rounded off, painted over or rusted screws and bolts. Suitable for majority sizes of a screw or a bolt..
✔ PROFESSIONAL HEAVY DUTY WITH IMPRESSIVE DESIGN AND SUPERIOR QUALITY - The left hand drill bits are made of high-quality high-speed steel. It has high hardness and durability, and it is easy to disassemble damaged screws. The spiral screw extractor made of chrome-molybdenum steel (high carbon steel) and sandblasted surface for greater durability and to withstand corrosion. The spiral pattern design can provide sufficient gripping force to facilitate removal..
✔WELL ORGANIZED IN THE CARRYING CASE - laser etched markings of sizes on bits that organized in the heavy-duty and lightweight plastic case for easy storage and transportation..
✔ COMFORTABLE, CONVENIENT AND EFFECTIVE FOR WIDE RANGE OF APPLICATIONS - The spiral flutes designed to enter deeply into the metal as you turn the tool for ....

Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys.
Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools.
performance is similar to uncoated tools.
Threaded shank is for use with threaded-spindle tools, often used in aerospace and automotive applications.
When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging.
Featured with 135 degrees heavy duty split point and surface treated for drilling hard, tough, high tensile strength materials.

M35 COBALT HIGH SPEED STEEL: 3/8" drill bits for metal made from M35 Cobalt High Speed Steel and contain 5% Cobalt, which increases wear-resistance, durability and extra longer life span, so that the drill bits last through multiple uses..
135° SPLIT POINT: 135°quick-cut pilot split points are self-centering and can penetrate quickly with less pressure. Straight shank allows for firmly holding and accurate centering and makes drilling precise and faster..
FULLY GROUND PROCESS: Fully ground spiral groove design clears particles quickly, decreases friction and heat for faster drilling performance..
PROFESSIONAL & WIDELY USE: Perfectly Suitable for drilling holes as Stainless Steel, Copper, Cast Iron, Galvanized Pipe, Aluminum Alloy, Wood and Other Softer Metals. Not for Glass or Ceramic Materials..
EASY USE & STORAGE: The set includes 5Pcs 3/8" Cobalt Drill Bits, This drill bit fits the majority of power drill currently on the market and come with a portable plastic case for easy storage and DIY, household maintenance and repair..