Found a tool and don't know what it is used for.

Wasn't sure which subreddit should I use for my question so I just used this one. Anyway. In basement I found a tool which looks like this: http://ift.tt/1y2GCEf

It has 3 letters engraved on: S M A. Appreciate the help.

Submitted November 29, 2014 at 01:25PM by v3vic http://ift.tt/1y2GAw8