Lisle 10500 2-Stone Brake Cylinder Hones. 2-Stone Hone Fits Cylinders 11/16" to 2-1/2" (17.4 - 63.5mm). Controlled pressure makes it possible to polish or hone with jus tone stone grit. Square ends of stones hone to the end in step-cut and blind-end cylinders. 240 grit stones are 1 1/8" long. Flexible driver.