Here is a tool for anyone that runs nitromethane or a high compression alcohol engine that does there own engine servicing should own. Wrist pins are something that are often overlooked but when they break it is catastrophic to the rest of the engine. This tool is simple to use and is very precision. Simply lay the wrist pin in the valley allow the indicator tip to drop onto the wrist pin and begin rolling around to check for runout or inconsistency's. Made from billet alum. and anodized for corrosion protection and durability. Works with all wrist pins.