Review on D180060 4 Inch Hole Saw by DEWALT by Dean Love

When building my new house I had to do some plumbing work. I needed several different sizes due to where I needed to place the line and the sizes I was going to use. After using these Dewalt hole saws years ago when building a log home, I bought several new sizes and found that they were winners again and worked great. I like the double acting cutting edges just in case I go through a nail in the frame when cutting a hole. To be clear this is just part of a hole saw, you will need a suitable dewalt mandrel to screw it in. and make them useful. There are a few tricks you need to learn when using these hole saws. The first is; I've found rocking the bit slowly works very well and the hole moves smoothly. I use a large Dewalt drill with a fairly large hole. The standard 7/16" arbor used in it does not fit the smaller 3/8" drill bits typical of hand drills. I also found that using a 120 volt drill made it easier and avoided waterlogging when cutting through the top panels of the wall. My 12 volt power drills just can't handle it. For example, if you go through a 2x4 piece, the drill will fill up with the small hole you just made. You must pull out the main body before you can drill through another layer of wood. You can use a screwdriver and pry it off the side using the slots cut in the drill bit. Another option is to unscrew the bit from the quick-change mount and hit it off center with a screwdriver and a hammer. If there is one downside to these drill bits, it is that when they are new they can sometimes be difficult to screw onto the mandrel. first time. The color is enough to make you think you could cross it. I found this by screwing it in a little, unscrewing it and then blowing off the remaining paint and working again. After several attempts you finally get to the mandrel. It may take a little effort the first time. 5 stars, I have used these bits to build a log cabin and several houses and they work great!