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Carbide Blades - Will stay sharp longer than steel blades but more expensive. Tile Blades - Usually have diamond tip blades and are designed especially for cutting ceramic tile. Masonry Blades - These blades are made for cutting concrete brick cinder block and other masonry material. They are made of abrasive material. What to look for when buying a circular saw I would definitely look for a circular saw that accepts 7 1/4 blades. These are the most common blades; therefore making it easier to buy blades down the road. Also I would look for a saw with a long cord as you would be surprised how many cords are very short. You can always add an extension cord on but I would look for a cord that is at least 8 feet in length. Another primary item to look for is an adjustable base plate. This is good for making angle cuts and sometimes comes in very handy. Cordless Saws - Cordless saws are nice because they have no cords to plug in trip over or even cut through.
An anti-snag lower guard is becoming the standard but some saws may still have trouble with snagging during beveled cuts. A lower guard that snags on the edge of a board can be dangerous. It can increase the chance of damage to the wood or blade but most importantly it can lead to serious injuries for people just learning to use a circular saw. - Motor Brake: This is exactly what it sounds like. Once you release the power trigger a brake engages that stops the motor from turning in about 2 seconds. It increases the safety of a saw though all circular saws have a lower guard that also helps protect a person and work surfaces from the spinning blade when the saw is not actually being used to make cuts. One additional advantage of a motor brake though is that it can allow you to make repetitive cuts quickly by reducing the time you wait for the blade to stop spinning from previous cuts. - Blower: A built-in blower is a nice feature.
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There is a time and place for a cordless circular saw this place is not designed to build an entire house with them but they will work for small projects around the house. Lets be real until there is a way to place all of the 120 volts of a corded circular saw into the size of an 18 volt battery pack a cordless circular saw will be at a distinct disadvantage in the way of power. All of that being said there are advancements that have been made on a cordless circular saw that many of the corded versions are not up to speed with. One of these is the side blower; this is designed in order to keep the cutting line clear of any debris that tends to cover up the cutting line when you are in the process of cutting a straight line. In addition there is the fact that the adjustments can be made on the fly as you are in the middle of a project. There is no longer a time that you have to take a lot of time away from the project that you are working on.