Marvin Ultimate Double Hung Magnum and Single Hung Magnum window pivot pin
The Top and bottom pivots are different sizes and are handed

Application: Top Sash
Handing: Left
Screw Holes: 2, spaced at 7/8 inch
Base Width: 1/2 inch
Base Length: 1-3/8 inch
Pin Projection: 5/8 inch
Material: Steel

Priced and sold as each

Related Marvin Double Hung Parts:
10500562 - Right Hand, Top Sash Pivot
10500563 - Left Hand, Top Sash Pivot
10500564 - Right Hand, Bottom Sash Pivot
10500565 - Left Hand, Bottom Sash Pivot