Sheet Metal Joining Solutions. Your go-to-source for clinching, specialty press, precision tooling & work holding equipment to improve your productivity. BTM offers hand-held clinching & floor presses, die sets, production fixtures & custom machines (including extended throat depth) for high-volume sheet metal joining & forming. HVAC clinching applications include ductwork, fans, louvers, air vents & metal filter frames, HVAC systems & housings. Sheet metal fabrication uses include metal structures & boxes, strut & brackets.