PMD Products Brake Master Cylinder Hone Bores 3/4" - 2-1/2" w/Stones 80, 220, 320 Grit Includes 3 sets of stones, 80 grit, 220 grit, 320 grit Brake hone is designed for use with any electric drill. Adjustable honing tension by turn of knurled thumb wheel. Perfect for wheel cylinders, master cylinders or small diameter tube applications. 80 Grit, 220 Grit and 320 Grit Grinding stone dimensions: 1-1/8" L x 3/16" W x 1/8" diameter; Note - use brake fluid as honing lubricant for brake systems as not to contaminate your brake system