About this item Package includes: 20Pcs stainless steel bore brushes for drill, bristle diameter: 5/16"(8mm), 3/8"(10mm), 1/2"(13mm), 5/8"(15mm), 11/16"(17mm), 3/4"(19mm), 7/8"(22mm), 1"(25mm), 1-1/8"(28mm), 1-3/16"(30mm); 10 sizes and 2 pieces each, Abrasive brush of different sizes can easily handle a wide range of cleaning work scenarios. Hex shank diameter: 1/4". Our Inner hole cleaning brushes are made by hand-twisting the stainless steel wire, compared with machine-twisted wire brushes, Their stainless steel wires are more evenly distributed and there are more steel wires. The filaments are twisted to the top of the brush head, which can handle more complex scenarios and is also more durable. Material: The abrasive drill brush are made of 304 stainless steel and featuring a twisted wire form to make them tougher and more durable for powerful cleaning. It can completely remove rust and details. Easy operation: Each brush has a 1/4 " hex shank, easy to replace, can be easily installed on power drill or mold grinder for efficient cleaning. The stainless steel bore brush can easily enter narrow areas, pipelines, or small holes, removing dirt, rust, corrosion removal and polishing of pipes etc. Drill wire brushes are suitable for various cleaning scenarios and can effectively meet the needs of household pipelines, industrial equipment, and cars, meeting your diverse needs. Overview Brand: MZCR-NNML Grit Material: Stainless Steel Bristle Type: Twisted Color: Silver Grit Type: Medium