Our 30 series is our most popular all-purpose toothbrush-style scratch brush, designed with a bend for knuckle protection. Heavy duty 0.006" stainless steel bristle, in a 3 X 7 row configuration, with a 7/16" trim, and a brush face of 1-3/8" x 1/4", with a strong, static-neutral plywood handle. This versatile brush is an effective tool for use in a multitude of applications and is perfect for descaling stainless steel and aluminum welds and for removing rust, oxidation and corrosion. National Stock Number (NSN): 7920-01-604-3307