Review on Positioning Aluminum Woodworking Carpenter Cabinets Industrial Power & Hand Tools for Workholding by Robert Howell

Most carpenters will need at least 4 of these clamps so this is not a cheap tool. I have used these clamps on two projects and they have worked well for making 90 degree glue boxes. Each clamp is printed with a metric scale and an imperial scale. 6 out of 8 scales are not accurate. Buy it for the clamp function, not the scale.