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Delta 17-780 1/4 inch Mortising Chisel and Bit Set Delta MORE INFO

From the Manufacturer Use this mortising chisel and bit set with mortising attachments or a dedicated mortising machine to drill square and rectangular holes for mortise and tenon joints. The two-piece design allows the drill bit to rotate and remove the bulk of the material while the hollow chisel maintains alignment to square off the sides of the hole. Designed for home shop and small scale applications, this set provides a clean finish cut at a more affordable price. For more serious woodworking or high-production work, use Delta Professional Mortising Chisel and Bit Sets. Includes one drill bit and one hollow chisel.