Please note that my price is cheaper than Grainger, motion industries and Amazon.  Also, one of the photographs shows the gear hub drilled and tapped for a 10–32 set screw. This is just to illustrate that while these are steel and are very hard they are not hardened and they are capable of being drilled for a cross pin or a set screw. 

The one that you will receive is still brand new in the package and has not been drilled.

For sale is one martin spur gear made out of steel and coated with black oxide to prevent corrosion. These are now stored with desiccant packs inside of our metal cabinets in an air-conditioned lab. I only have a few of these left so they will not last long.

All of the measuring instruments are for illustration and are not part of the sale. If you pay by noon Eastern time I will mail this the very same day.