This odd-shaped chisel with two blades rotated 90˚ to each other allows you to cut square-sided mortises in tight places you’d never be able to reach with a conventional chisel.
Chris Becksvoort designed this modern reproduction of the traditional drawer lock chisel, and Lie-Nielsen manufactures it with 0-1 tool steel and precision-grinds it here in the USA.
You’ll pay $75 for a pair of these chisels. We’re not sure why Lie-Nielsen sells these chisels in a set of two — from the picture we can’t see much difference between ’em. Maybe somebody can give us a clue in the comments.
Drawer Lock Chisel [Lie-Nielsen]