Positioning Squares, 90 Degree Corner Clamp, Right Angle Clamp Woodworking Tool, Carpentry Squares, Carpenter Tool for Picture Frames, Cabinets or Drawers, Set of 6（3" 4"6"）

In all of them they are out 3/32 of an inch inside and out. If you build a box 4x3/32 thats a lot. This test was done with it incremental right angle square Guaranteed .001 Sq. I also laid it on a square table drew a line flipped it over through another line to determine that it was 3/32 of an inch out. I build small jewelry boxes and shadow boxes amongst other things including picture frames and these will not make it square.

I am very glad that I got these and the first thing I did was to check them with my machinist squares Starretts at 0.001 accuracy. Now here is the thing, looking at this as a X and Y position (left to right and front to back) the X and Y solid measuring sides on the 6” and 4” had a concave or inward to the center of the X and Y center area. Now as far as “”was the X and Y plain square?” The answer is yes but I didn’t see some of the perfect surface joining as others showed in their photos and to be honest, as a professional photographer this is not easy to Photograph because we are talking about hundreds of an inch in not perfectly square. Remember, this is plastic. It is solid feeling and almost difficult to bend (I didn’t want to break mine) so for 98% of the needs out there it will be fine. Wood workers will love it. But for me I either use the whole length of the measuring sides on nothing at all. In other words, don’t try to square a a 2”x3” item with a 4”x6” positioning square... use the smaller one. I will try to update this review with images and measurements on my straight steel edge with 0.001” accuracy over 24”. I think these are great and I would not hesitate to buy them again. My metal squares are the best but not as clamp friendly as these are. Buy them, you won’t be disappointed. This was the best deal I could find.

Approximately correct as you can see that internal and external angles are not precisely 90%. Not good if you’re going to make cabinets or precise boxes with exotic woods.Not a good value for money if you are looking for precision and accuracy in your woodwork or furniture assembling. Very sturdy though but that’s not the main feature of this product. Should be accurate.

Great price but the larger ones required lapping. They were slightly off of 90 degrees. It only took a couple of minutes of lapping with 150 grit sandpaper on a granite block. I made about 5 strokes and then I checked it with my reference machinist square. 15-25 strokes brought them dead on. They worked great during my most recent bedroom dresser project. Glueing up 8 drawers was greatly simplified. Well worth the price.

Weekender: buy it. Professional: skip it. The set does not hold "true" square as it's plastic mold and was not 100% edge clean. I put half hour to square and clean up the edge; good enough for occasional use.

These are awesome. Great to have something to make 90 degree angles a breeze. Clamps fit fine on the brackets and the amount of sizes for the price is unbeatable. These line up to be perfect angles.

I bought this set of small squares to use in modeling HO scale buildings and they are just what I needed. I recommend them for anyone who needs tools to help get nice square 90 degree angles on small models.

Used these to make a 4' frame for an artist canvas. The cross bracing is dadoed. Everything else is a combination of wood glue and pocket screws. I added gussets in the corners later. The positioning squares did exactly what they were designed to do until the glue dried. Frame came out perfectly square. Keep in mind though, these are not machinist squares so don't rely on them for setting up your tools to make precision cuts. For assembly work they're more than sufficient and I can recommend them.

I was pleasantly surprised with these, alot better than first expected. Accurate and solid build will use over and over. Only let down was delivery, was supposed to be next day before 1pm as I needed them and this set said it would be but wasn't so could of bought a different pack that was cheaper and just the larger squares that I needed.

These are well made and providing you have clamps you will make right angled joints. Straight forward, sturdy, and fuss free.

They have a lot more uses than you think. Bought for making wooden toys.

Looks like plastic is strong but measuring scale is not accurate. There is difference 1mm on 8cm length between smallest and biggest one. 90 degrees angle looks accurate.

These corner clamps are very solid, manufactured from rigid plastic. They seem accurate and as a 12 piece pack are great value