Deltana CC78 Corner Chisel for Squaring Radius Corners 7/8" Depth Model: DEL-CC78 CORNER CHISEL FOR SQUARING RADIUS CORNERS 7/8" DEP The Deltana Corner Chisel is an accessory used for preparing the door for the installation of square corner hinges. U/M (Unit of Measure): each - (Price displayed is per unit) Chisel Depth: 7/8" Depth Deltana $24.65 $18.49 $17.99