360 degree protractor designed for accurate angle measuring for determining to angle of a string line. Typically when laying out a fence line, use this instead of the 3,4,5 method when trying to get a 90 degree corner. This is much faster and easier.

2 versions,  8 in version with a hole so you can insert a screw to make it tougher for longer wear and be able to put tension on string line. 6 in version, 6 in with an inner circle of 4 in for an added use to mark can light holes. In used a 2x12mm 0r 2x16mm cap head screw. Enjoy!  Suggest printing in PETG or stronger material.