This is a diecast handle extender for crank-out window and roof vent handles.
It has a 7/8 inch long shank.
It is externally and internally serrated for use with 5/16 inch spindles.
You will receive 2 handle extensions.
Priced and sold in pairs.
This product is similar to or the same as the following part numbers in these brands:
Prime-Line Products: R 7012