【The set includes】:1Pcs Diameter 42 x Height 20 x Round Shank 6mm,1 Pcs Diameter 55 x Height 25 x Round Shank 6mm. 【Good performance】: The bowl-type grinding head has a fine workmanship, is sharp and wear-resistant, and runs fast, enabling fast grinding. 【High-quality materials】: These polishing wheels are made of high-quality tungsten steel materials with high strength, high efficiency and long service life.