This replacement or spare magazine is compatible with your S&W SD. It is constructed of heat treated steel with injection molded mag follower and mag spring formed from chrome silicone wire. Made in the USA.
Specifications:

Caliber	9mm Luger
Capacity	32rd
Finish	Oxide
Model	Standard
Material	Steel
Type
Model Fit	SD
Brand Fit	S&W
Capacity	32