Sheet metal crimpers downsize one end of a round duct so it can fit tightly into the uncrimped end of another length of round duct. Their bladed jaws press into metal to create long, shallow indentations until a crimped band is formed fully around the duct.

Metal stud crimpers join stud-and-track framing without using fasteners. Their C-frame head holds a punch and die that form tabbed, rectangular crimps along the stud and track to bind them together. Also known as furring crimpers, they connect framing faster than screw fastening and leave no screw heads to pop through the drywall.

Downspout crimpers downsize one end of a downspout so it can fit tightly into the uncrimped end of another length of downspout. Also known as gutter crimpers, their bladed jaws form double crimps that keep the downspout corners square for a leak-resistant connection.