Lisle 3-Stone Brake Cylinder Hone

3-Stone Hone fits cylinders 27/32" to 2" (21.4-50.8mm). Controlled pressure makes it possible to polish or hone with just one stone grit. Square ends of stones hone the end in step-cut and blind-end cylinders. 240 grit stones are 1 1/8" long. Flexible driver.