This bag is from a 2011 set, it's 150-250 pieces and it appears to be a car.
This is from set 60007: High Speed Chase based on Chains M Plate M 5 ظ3, 2 Hole. There are only two sets with this part in Medium Stone Grey. The other set is the Star Wars UCS B-wing
-
Since this answer was written, the Technic Link Tread has appeared in Light Bluish Gray in five additional sets. – shoover Jan 2 at 2:11
