These brushes are a versatile tool for many finishing applications including: surface polishing, deburring, removing tool marks and EDM scale. The ceramic fiber bristles produce a uniform finish and are color coded for easy grit identification from 150 up to 1200 grit. Easily dress shapes and angles into the brushes by using a diamond abrasive file. For example, you can dress a 45 degree angle to match the form of your working surface. Can be used wet or dry. Use in a micromotor handpiece or in a CNC machine. For 150 - 1000 grits Max RPM is 15,000. Recommended RPM 6,000 – 12,000rpm. For 1200 grit Max RPM is 12,000. Recommended RPM is 6,000 - 8,000rpm. 3mm shank. Length: 1-15/16” Width: 3/16” (50mm x 5mm). Also available as a set (see related products). Made in Japan.