Lot of ten SCSTool PTBSS-12 stainless steel power tube brushes for general de-burring and cleaning operations Brush diameter is 3/4 inch x 3/4 in long and overall length is 3 1/2 inches Bristles are .006 in stainless steel, single spiral Stem is 7/32 in electro-galvanized steel Maximum 2,000 rpm clockwise only These are top quality Industrial Duty brushes made in USA