Helix Oxford Set Squares 45 and 60 Degree 31cm. Pack of 2 Set Squares from Helix. Metric and imperial graduations for accurate measuring. Each piece is transparent blue making your work easy to read. This set of set squares includes 45 and 60 degree angles. Tinted blue for clarity and easy to read, single colour print. Part of the traditional Helix Oxford range, a brand trusted for its premium quality and reliability.