Please check  compatibility with your machine.  The following info came from the manufacturer site. Please verify on your own as well.

Has been stored for some time but item has never been used.

The KitchenAid K5AWW 6-wire whip is designed for 4.5 and 5-quart bowl-lift stand mixers, specifically fitting models K4, K4SS, K5(A), K5SS, KG25G7X, KG25H0X, KG25H3X, KP50PS, KSM450, KSM455, KSM5, KSM50HDP, and KSM500.

It is not compatible with tilt-head models.

Key Compatible Models:

K4SS, K5SS, K5-A, K5

KP50PS, KSM50, KSM5, KSM450, KSM455, KSM500

KG25G7X, KG25H0X, KG25H3X

This attachment is ideal for whipping air into mixtures such as cream, egg whites, and meringue. Ensure your mixer is a bowl-lift style (where the bowl lifts into place and the head is stationary) to ensure compatibility