Our Premium Single Row Style Cup Grinding Wheel is double laser welded and contains 40%-44% diamond concentration. We use a 30-40 grit, grade 10 GE diamond that will hold up to even the most abrasive concrete. This premium cup wheel will tear through concrete like no other! Available for 7/8 arbor with a 5/8 Bushing or 5/8 -11 Threaded Arbor.