Veritas’® magnetic corner chisel is designed specifically for squaring off the corners of routed hinge gains. Its 3/8" square blade is precision ground with a 35° bevel on each face. The blade is made of long-wearing A2 tools steel, hardened to a rating of Rc60.
Although it can be used alone, you can gain greater accuracy by using it in conjunction with the 2" tall anodised aluminium guide block (included with chisel). Two embedded rare earth magnets hold the chisel squarely in place while the outside faces of the block align against the routed pocket.
A tap on the chisel cuts the corner square and flush with the routed edges. You will come to appreciate the long-wearing properties of the chisel when you finally have to resharpen it.