APEXX Brazed Angle-Grinder Profiler. B7 - Pos.1 (1/4" Roundover). 1/4" Roundover Edge. THREAD: 5/8”-11. SLAB THICKNESS: 2cm & thicker. SUGGESTED RPM: 3,000 -- 4,000. Built for profiling contertop edges with 5/8"-11 angle grinders; Premium brazed diamond for both cutting speed and tool life; Nylon guide will not scratch the stone surfaces; Well balanced, easy to use; Recommended to use with angle grinders with central water feed; Material: Engineered Stone, Granite, Marble; Dry or Wet use.