The B7 is meant for either diamond grinding or polishing. The one-inch mounting shaft, washers and nuts are all solid stainless steel and the wheel and belt guards are thick molded plastic so that rust will never be a factor. The shaft ball bearings are oversized, sealed and permanently lubricated. The motor is the best available-a Baldor "industrial-type" with ball bearings. Every aspect of this machine is over-designed to create a trouble free machine..
