Square corner chisel for squaring up round corners,main usage is when you route a hinge or to square up rabbets .3/8 inch cutter edge,This corner chisel can be used for easily and accurately carving the inside round corner cut outs of your woodworking router projects .High precision chisel ,self-aligns for optimum accuracy,the chisel is resharpanable .Overall size is compact enough to carry in your pocket, take with you in any toolbox, or store on any shelf .You use it in a way that you position the chisel into the round corner and hit with a mallet and clean up the excess with a regular chisel .Designed to create square corners in router hinge recesses, door lock recesses, hinged mortises, wood flooring stock, picture frames, and other applications where precision corners are desired . Portable Right Angle Chisel Tool for Woodworking Tools Accessories High quality material, sturdy and durable Convenient and portable to use Material: aluminum alloy