This is a brown plastic handle designed for crank-out windows.
Shank is 2-1/8 inches long.
It is internally serrated and accepts a 5/16 inch spindle.
These are sold as pairs and priced as pairs.
Package contains 2 handles
This product is similar to or the same as the following part numbers in these brands:
Prime-Line Products: R 7002
Strybuc Industries: 750C2-1/4 Blk