Narrow hardwood block brush head enables enhanced pressure transfer for more effective scrubbing, brushing, and moving debris. The two threaded handle holes allow you to easily screw in handles and switch the brush orientation to achieve more even bristle wear over time. Built with a strong and durable hardwood block head for use with threaded 1.13-inch diameter handles, which are sold separately. Hardwood Block-Stiff Polypropylene Bristles. Bristle Material: Polypropylene; Brush Length: 10"; Bristle Length: 2"; Bristle Color: Cream.