"MORTISE CHISEL/BIT 1/4"""

The bit removes most of the material, and the chisel squares up the sides, allowing you to cut precise 1/4" mortises for mortise-and-tenon joints. Fits the Jet Benchtop Mortising Machine (#81421, sold separately). For use with Mortise machines and drill presses with a mortising attachment.

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www.P65Warnings.ca.gov
You may find more information on the State of California's Proposition 65 website at:https://www.oehha.ca.gov/prop65.html