Unless you're the kind of homeowner that thinks a poured concrete slab makes a nice weekend project, Max PSI's rebar-tying tool probably won't be on your Father's Day wish list. Nevertheless, it was too cool to pass up. Fit the gun's jaws over a rebar intersection, pull the trigger, and a second later a tie flies out and twists up to hold the pieces in place. Think Spider-Man. Approximately $2,450, maxusacorp.com.