Amazon.com Product Description
The GuildCraft 4-Piece Mortise Chisel and Bit Set is made of steel 48 Rockwell Hardness to ensure strength and durability, and contains 1/4-, 5/16-, 3/8-, and 1/2-inch mortise chisel and bits. The chisel and bits have a honed finish, and are contained in a protective canvas tool roll. The included parts fit all major bench top mortisers including Fisch, Delta, Jet, and Powermatic.
From the Manufacturer
Contains 1/4",5/16", 3/8", 1/2" mortise chisel & bits. Fits all major bench top mortisers Fisch, Delta, Jet, Powermatic. Honed finish - ready for use.