Nylox® Power Tube Brush, 1 in Brush dia, 2-1/2 in Brush Length, 5-1/2 in Overall Length, Nylon/Silicon Carbide Fill, 0.022 in Filament/Wire dia, 1/4 in Stem dia, Single Spiral, Double Stem. Weiler® 21138 Nylox® Power Tube Brush, 1 in dia x 2-1/2 in L, 5-1/2 in OAL, 0.022 in dia Filament/Wire