Rivets create permanent connections between two or more materials by inserting through them and clamping the materials together from the front and back. Blind rivets are inserted through the exposed side of a blind hole to create a joint. Solid rivets are inserted through the backside of a hole and are pressed until their shanks deform, clamping the materials together. Tubular rivets have hollow shafts that are easier to install than solid rivets. Push-in rivets push into holes from the exposed side to hold two items together. Drive-pin rivets are installed through the materials being combined and expand on the interior surface when installed. Rivet washers spread the clamping force of a rivet over a wider area, reducing surface damage while improving their hold. Lock bolts and lock bolt collars work together to join materials by clamping them from two sides.