GZ01102 | Groz Machinists Square 100mm Whilst ideal for everyday workshop use these are also suitable for woodworking applications. Made from high grade steel with hardened blade these squares have accurate right angles both on the inside and outside. Both the blade and stock are accurately ground which ensures straightness and parallelism. Specification Blade Length: 100mm Stock Length: 75mm Squareness of blade edges to working faces of stock: 48microns