Check the listing for details. 1 Wilson machine shop rockwell hardness tester checking plunger knife edge part. Condition: New. Listed at 14.50 USD. 23BD11U04 up for sale is a part that came from a closed machine shop , this is a used on a wilson rockwell tester unit , This is some type of spare part that has two precision ground sharp end on both ends , this part measures 2.627 long by 0.650 Outer diameter , the center has a hole that is 0.310 diameter , we do not know the part number this came loose into our warehouse not marked , If you know the part number or where this fits on the tester let us know , well made parts not sure exact manufacturer could be a wilson OEM part but not marked anywhere , , comes loose as shown in the photos , note the photos represent the unit you will get we got a group of these in from a closed GM auto plant , appears to be a new part from factory surplus some are shiny ground on the outer diamerter so are darker and show heat treat color and come are dipped in protective wax to keep them from damage , all appear to be good usable parts , see our store we add new items weekly , thank you for viewing our store and supporting a USA based small hometown business , thank you rwk