- Alvin AS680 6" & 8" Transparent Triangle Set

For my purposes - woodworking, mostly - these are quite nice and seem as if they'll hold up in the shop. I actually took a year's course in Engineering Graphics many (many) years ago, and have always since kept a selection of drafting instruments. These may not be K&E or Dietzgen quality from "that era", but they are perfectly serviceable.

You might think that triangles can't go wrong. But I bought one set before (different product) and I had the following problems: -the edge have slope, so it tend to slip under the T-square like a chisel -tainted clear, not 100% clear, so it is not so easy to see through These triangles have good thickness and straight edges so they align well with the T-square. And they are just clear without taint or anything so you can easily see through. The only thing is that they are not graduated, probably on purpose to maximize clarity, so keep that in mind if you are looking for graduated triangles

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They are what they say, the angles aren't marked but it's not exactly hard to tell which angle is what. There also isn't any ruling markings besides it telling you the longest sides are 6 and 8 inches. I would've preferred more markings, but it's a good price and they work fine.

You can't go wrong with Alvin products.

The edge is not perfectly straight.

Need this on my job and wanted a spare one. Actually I got two in the package. Just the right sizes and shapes. Would buy again.

Does not meet the basic requirements of being a triangle with a straight edge. The cut edges are rough and curved in multiple directions.