Cement board shears cut through fiber cement siding and sheets. They press their pivoting blade between their fixed blades to make long, straight or slightly curved cuts. This punching motion leaves clean edges without breaking the board and produces larger dust particles than sawing, reducing fine-dust breathing hazards. Cement board shears are commonly used to cut backing for tile, underlay for countertops, and substrate for plaster and stucco. Corded shears allow long run times for repetitive tasks, maintain full power during operation, and have no batteries to recharge. Cordless shears operate in areas without access to wired power and run on brand-specific batteries.