Probably the easiest-to-use corner cleaning chisel we've seen. The (resharpenable) M2 high-speed steel corner chisel is held captive and spring-loaded in the painted aluminium body. Simply slide the body into the mortice recess to register it square and tap on the anvil end to cut out the corner square. Ideal for hinge recesses in door frames and door edges, as well as lock faceplates. Reliable quality for regular trade use on jobsites.