This is a genuine manufacturer sourced replacement part designed for use with jointer-planer. This part helps to secure knife inserts to the helical cutterhead. This part is made out of metal and it is sold individually. Requires a torx screwdriver to install or remove this screw.
The knife inserts attach to the cutterhead. This item is sold as a set of ten, but keep in mind that more might be needed. These are genuine Powermatic and Jet replacement parts used in compatible jointers and planers. They are made of metal and are sharpened on four of the sides. If they become broken or dull they will need to be replaced.