Based on the classic Nobex quattro folding squares, the Octo square has been redesigned for marking 8 angles instead of 4. The Octo still has the same accurate design and now stops at 157.5°, 135°, 112°, 90°, 67.5°, 45° & 22.5° with those famous heavily tested bearings. The price is virtually unchanged so you are getting twice the tool for the money!