Add Yahoo as a preferred source to see more of our stories on Google. Look around any home and yard, and you'll find dozens of screws, nuts, and bolts. Screws are usually used in wood and drywall.

Ever been strolling through a hardware store or perhaps an auto parts establishment and wondered of the meaning behind the markings on the hundreds of thousands of bolt heads on the shelf? Whether you ...

Look around any home and yard, and you'll find dozens of screws, nuts, and bolts. Screws are usually used in wood and drywall. They fix into something. While it's important to know the right screw for ...