Maun carbon steel straight edges 30 120cm maun 1701 018 this 45cm carbon steel straight edge from maun can be used for a number of tasks including cutting photos and posters drawing scribing or checking surfaces for straightness the straight edge is for accurate marking out with a carpenters pencil or metal scriber making it ideal also for engineers plasterers builders and decorators accuracy is 001 of the length of the straight edge maun 1701 018 carbon steel straight edge 45cm