Cling On Block Wall Paint BrushesCling On Wall Block brushes are ideal for applying poly, stain, varnish, color washes, and painting walls. Painting table tops a lot? Having a hard time getting it "brushstrokes free"? Use a Block Brush! You are done in a blink of the eye! We have them in 2 sizes, the bigger the better! But maybe the B12 is a bit too heavy for you, then go for the B10. B10 Small Blockbrush Width: 4" (100mm) Filaments length 2. 75" (70mm) Handle: 5. 4" (137mm) B12