Index center height is 70mm,divisions are 2,3,4,6,9,12,18,36.matched 5C collet,divisions from 1 to 360 degree . This index is suitable for milling,grinding and drilling machines.It is simple in construction,easy in operation and reliable.It can make 2,3,4,6,9,12,18,36divisions. VERTICAL F1-5C INDEX