32 pitch alloy pinions are not heat treated and should only be used with plastic spur gears. If you only run plastic spur gears these pinions are the perfect choice. 1/8 inch bore. One 5-40 set screw included. 1/16 inch allen wrench (not included) fits the 5/40 set screw. 32 pitch Alloy Pinions are not marked with tooth number.
