Brass end brushes, with 0.3mm diameter crimped wire, allow for fast surface cleaning. One-piece ferrule construction ensures that the stem and ferrule will not become separated during use. The brushes are designed to follow contours and intricate surface patterns. Available in three sizes: 12mm (1/2"), 3/4" and 1" diameter. Shank diameter is 6mm (slightly smaller than ¼”) for the 12mm brush and 1/4" for the two larger brushes. Maximum RPM is 20,000rpm. Made in China.