Weiler 21090 Maintenance Tube Brush, Industrial Grade Performance Line, 3/16 in Brush Dia, 1-1/2 in Brush Length, 7 in Overall Length, Steel Fill, 0.003 in Filament/wire Diameter, 3/32 in Stem Dia, Single Spiral, Single Stem and Loop. Tube brush for internal cleaning, deburring, and surface preparation of holes, tubes, and pipes. Manufacturer part number: 21090.