If you've ever wondered if your handcrafted reloads match up with minimum chamber dimensions, pick up the LE Wilson Brass Min Dimension Gauge, start checking, and know for sure. This measurement tool has been engineered with the exacting tolerances you expect from the experts at LE Wilson, which means it accurately verifies minimum chamber dimensions and OAL for SAAMI. There are multiple reasons to want a Min Dimension Gauge. Reloaders everywhere use this tool when they want to reload rounds to chamber in a variety of guns. Or they may want to check for uniformity of rounds they've crafted against SAAMI specifications. Other might need help pinpointing issues with their reloads or use this gauge to quickly check to see if they're under MAX SAAMI COAL. Lastly, some might enjoy doublechecking store-bought, factory-made ammunition. It is recommended that this tool be used in conjunction with a regular case gauge to prevent oversizing. It is further recommended that a regular case gauge be used for bottle necked cartridges when determining how much to trim. Made of brass. Check your reloads against minimum chamber dimensions Engineered with the exacting tolerances Designed for SAAMI chambers Multiple reloading uses Made of brass