Cylinder Hone, Manufacturer suggested retail price. $16.45 Features and Benefits: 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 to the end in step-cut and blind-end cylinders. 240 grit stones are 1-1/8" long. Flexible driver. Skin-packed. Manufacturer: Lisle Lifetime warranty does not cover abuse