Our new 4" "C" Brand sintered engraving wheels are in stock! These high quality, diamond wheels from Ukraine are an excellent choice for your engraving needs. Sintered diamond wheels have diamond embedded in a metal matrix. The sintering surrounds the diamond so only part of the diamond is exposed. This means the diamonds will be less aggressive at grinding, but it also means your wheel should last a lot longer! These engraving wheels are shaped with either a point or a radius and will outlast an electroplated wheel. Each wheel is 1/4" wide and has a 1" arbor hole that can be bushed down to 5/8" or 1/2".