Editorial Product Review:Item Description:Casement Trim Tool - CASEMENT TRIM TOOL. Install trim fast & accurately. Reduces measuring errors, waste and splits. Use as handy combination saw
Amazon.com Review:This tool makes humans as close to foolproof as we can get, at least when it comes to measuring, cutting and installing trim without a flaw. We love that it’s a solid piece, with nothing adjustable on it, so you know its 45- and 90-degree angles are always true. It takes the gymnastics out of measuring, too, whether screwed to your workbench or temporarily tacked to the working wall with 6d finish nails, because of the built-in tape measure hooks. Even tricky inside-to-inside miters are a snap. Perfect 3/16-inch reveals on windows and door jambs are guaranteed every time: Just line it up and draw your guide with the pencil holes. Though it’s marketed for casements, we’d keep it in the toolbox for all kinds of jobs. Imagine installing baseboard up to door trim and lining up the Trim Loc for a perfect cutline every time. We think it’d be the perfect gauge for squaring saw blades, too. This little tool will save you time, money and lots of frustration.
--Kris Jensen-Van Heste
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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For amateurs not pros
This might be useful for a DIY newbie, but any pros thinking it's something a tool junkie needs to hang trim- forget it. Just another solution looking for a problem.
Customer Rating: 
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Trim-Loc Tool
This is a handy tool that takes a bit of getting used to.
Pros
You put it to the casement much like a speed square
It automatically gives you a 5/16 reveal
You can drag it along the casement to scribe your line, if you like
Is handy to push molding against to nail
Grooves for automatic length measurement
Con
The slots for hooking rule too small for Stanley Fat Max
Customer Rating: 
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Very handy.
Use it to do the trim on the inside of a whole house. Cut the time in half. Very few recuts with this.
Customer Rating: 
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Great Tool, I own 2 of them for even easier installs
I bought 1 because I was going to be installing new trim on all the doors in my house, and then got a second from my wife for christmas. It was actually a good thing. I have the first one nailed down on a lond piece of 8" wide Pine which I use to measure the length of the cut that I need. The second one I carry around with me and use to mark the door jam for measuring, and then to line up the trim for install. I reccomend using a nail gun instead of a hammer because I found you need a third hand when trying to use the hammer and the tool.
All my reveals were perfect, and the miter cuts were right on.
The main diffrence between the metal and plastic is that the metal tool is 1/4" reveal and the plastic is 3/16" reveal. I thought 1/4" is a bit much, but the 3/16" looks perfect. For those worried about using a plastic tool, it has held up perfect for this project, and will be fine when I go to replace all the trim when I replace the windows.
This is a great tool, and really sped up the time it took to install the trim.