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