The irwin marples mr2210 mitre square has a hardwood stock and hardened steel blade it is designed to mark out an accurate 45 angle ideal for the construction of picture frames or installation of mouldings all marples measuring tools are made from an aluminium block and with a hardened steel blade which is secured by three steel rivets with brass washers preventing movement the scales are etched on the surface which ensures long durability the tools are manufactured according to a very fine tol