Some Angle Grinder Basic Stuff - SPACO
Sep 07, 2017· The "4 1/2" is the outer diameter of the largest disk that will fit on the grinder. There are also 4 inch, 7 inch, 9 inch and even 14 inch angle grinders out there in the world of cutting, grinding and polishing. The shaft the sticks out of the end of the angle grinder at a 90 degree angle is the "spindle".