JoolTool 3M Scotch-Brite 6 Piece Deluxe Miniature Bristle Brush Kit Assembled with 3/32" Mandrel, 4 Ply, 3/4" Diameter Used for same type of work as the larger 2" and 3" brushes, but on a smaller scale; the kit includes 6 of each grade 80 (yellow), 120 (white), 220 (maroon), 400 (blue), 6 micron (peach), 1 micron (green) Use on metal: great on jewelry; purpose dictated by grade used Use on wood: great for carvings; purpose dictated by grade used They come mounted on a 3/32" shaft for use in any of our handpieces Size: 3/4" diameter