This is a general purpose disc for cutting all types of metal. Made of normal corundum. Medium hardbond. It has a good service life and is fast cutting with a reasonable price. Manufactured in accordance with EN 12413. Dimension in mm: from 75* 1.6* 10 ( 3* 1/ 16* 3/ 8 inches) until 400* 3.2* 25.4 ( 16* 1/ 8* 1) RPM: from 20, 300rpm until 3, 800rpm All models with 80m/ s, and flat pattern and some with cymbal pattern