These 3mm shanked ceramic brushes are a versatile tool for many finishing applications including: surface polishing, deburring, removal tool marks, and EDM scale. The ceramic fiber bristles produce a uniform finish. Each set includes one each of 150, 200, 400, 600, 800, 1000, and 1200 grit brushes and are color coded for easy grit identification. Easily dress all shapes and angles on the brushes using a diamond file. For example you can dress a 45-degree angle to match the form of your work surface. Can be used wet or dry. Use in a micromotor handpiece or in a CNC machine. Always wear appropriate safety items, especially goggles, gloves, protective mask, long sleeve shirt and pants. The grinding powder can damage machine parts. During polishing use a dust collector and keep the equipment clean to avoid the abrasive powder from entering inside the machinery. Maximum RPM is 15,000rpm, recommended is 6,000 - 12,000rpm. Dimensions: 50 x 5mm (1-15/16"L x 3/16"W) on a 3mm shank. .Individual brushes are also sold separately. Made in Japan.