Brush Research manufacturing Series 81a Kit, ideal for Micro Burr removal, internal cleaning, rust removal and surface preparation. Kits contains 12 brushes. Available for both Decimal and metric hole sizes. The inch Kit includes .032, .047, .054,.079, .094, .109, .125, .142, .156, .172 and .189 sizes. Also included with this selection is our premium double end pin vise which provides a safe and secure means of using the brush. Double collets on both ends make this an exceptionally versatile holder. Brushes can also be run under power. Do not reverse the brush inside a hole. Each brush can be ordered in 12 piece standard packs. Larger sizes are available.