Used for cutting (obviously) cement siding board and backerboard, cement siding shears will handle siding up to 1/2″ thick. Coastal Tool has the DeWalt D28605 Cement Siding Shears for $189.00.
The two side blades are reversible for double the life (although doesn’t the center blade then wear out first?). The head can swivel on the body. The reviews on Amazon [What’s This?] are a bit mixed, but that’s par for the course for DeWalt.
DeWalt D28605 Cement Siding Shears [coastaltool.com]