For sale is a Made In USA (MSC), 1/2" Head, Adjustable Stop Countersink, No. 152-3-100-.1610.  The countersink is new and unused and comes in the original plastic bag.  I have several available so if you buy more than one, a discount is applied.  The first 3 to sell are in the factory sealed bag. The 4th to sell is the exact one used for the pictures.  The countersink(s) will be shipped promptly from Missouri.   Thanks for looking.