From the Manufacturer

Marshalltown 14731 Tie Wire Twister has a durable design the safely and easily twists wire bar ties. The compact size allows the tool to be used in tight spaces. This tie wire tools spares your fingers and other tools from the stress of tie wrapping rebar, allowing you to easily twist the wire around rebar grids making sure they stay in place while poring your concrete. The handle is made of plastic.