DEWALT Cobalt Alloy Steel Drill Bit Set with Pilot Point, 14-Piece (DWA1240)

Product Information

The cobalt drill bits are supplied in a large tough case, ensure secure tool storage and durability and protection in various environments M42 cobalt drill bits, which have 8 percent cobalt, are the hardest drill bits available. Why Trust Bob Vila Whether drilling wood, masonry, acrylic, metal or any number of other materials, having the drill bit for the job will give you the ability to drill with confidence and accuracy. Some drill bit sets will offer a mix of bit type to cover all types of jobs from wood and metal through to masonry, with some also including more specific bit types such as flat wood drill bit or countersinks. Drill Bit Sets are used by professional electricians, builders, plumbers, roof installers, etc. and DIY enthusiasts. Cobalt drill bits consist of steel with a small percentage of cobalt—the higher the percentage of cobalt, the more heat-resistant and durable the drill bits will be. The amount of cobalt in a drill bit varies. An M35-grade cobalt bit contains 5 percent cobalt, while an M42-grade cobalt bit contains 8 percent. The higher the grade, the more expensive the bit. Tip Point Titanium drill bits are durable and will hold up much longer than standard high-speed steel drill bits, but they are not as strong as cobalt alloy, which will drill through hard metals, including titanium. Q. What are the hardest drill bits?

Not easy to find non-MIC M35 (5% Co) sets here unless you want things cheap. In fact, this might be the only set as of now. DWA1269 - First, there's nothing wrong with the the metal case. Nothing special but nothing wrong. Next, in this era, this is a steal if you can buy this 29-piece M35 set for about USD120 or less.

Other than this, kinda tough to make any other meaningful side-by-side comparisons coz all bits are of progressive sizes. The Stroton cobalt drill bits featured a round shank with a low-profile stepped split point. They performed smoothly with or without center-punch starter guides. Unlike the more exaggerated pilot-style stepped points found on the DeWalt and Milwaukee bits that we tested, this design only stepped up a total of about 0.5 millimeters above the shoulders of the bit point, despite having more steps. Machinists, mechanics, DIYers, and crafters value cobalt bits for their ability to drill hard materials and because they can be resharpened. We spent 12 hours testing these drill bit sets. First, we used a drill press to evaluate them for drilling ability in aluminum, cast iron, and stainless steel. Then we resharpened them before performing a second round of drilling tests. (For most products, we used a drill press for each set of holes; however, for two products, we used a drill press and a cordless drill, as noted above.) It takes a tough bit to drill through hard metals like steel and bronze, but drill bits like these from Stroton are up to the task. Stroton uses what it calls a three-step design with this drill bit. Borrowing from step-bit technology, the tip of the bit is composed of three separate steps that help drive the bit through hard metals. This 19-piece metric set features sizes ranging from 1 millimeter to 10 millimeters.

Tool Steel with Tungsten Carbide Tips– TCT provides a longer working life for the bit while allowing for a more stable and solid tip and enabling it to withstand more rigorous drilling applications. Counterbore. Counterbore drill bits create holes that allow the head of a fastener to sit below the material’s surface. Unlike countersink bits, which create an angled hole for fasteners with angled heads, counterbore drill bits create a larger hole at a shallower depth. A counterbored hole creates a flat ridge on which the head of the fastener can rest. Drilling through steel, cast iron, and other metals produces tiny shards that can end up in skin or eyes, so make sure to wear protective gloves and safety glasses when working with cobalt drill bits.You don't have permission to access "http://www.homedepot.com/p/DEWALT-Cobalt-Alloy-Steel-Drill-Bit-Set-29-Piece-DD4069/203321667" on this server. cobalt content prevents maintains a sharper cutting edge and delivers • 4x longer life, and also provides stability at high temperature when drilling tough materials Cobalt Steel– The cobalt content increases the strength of the bit and aids in the resistance to heat and friction, so it can be used for more stubborn materials. Step drill bits offer the advantage of fast, clean precision drilling into thin metals without changing bits. Each of this set of three cobalt step drill bits is designed and engineered to drill up to 1,000 holes into 14-gauge steel. They feature a rapid strike tip for faster starting, elongated dual flutes to reduce heat buildup, and smaller step gradients for smoother drilling.