The Brownells Screw Chek’r is a durable, steel measuring tool designed to help gunsmiths and machinists quickly and accurately identify screw sizes and thread pitches, eliminating guesswork and ensuring proper hardware selection. Its clear markings and straightforward layout make readings easy and reliable, streamlining everything from part replacement to new builds while holding up to constant use in a busy workshop. If you want, I can shape an even tighter version that focuses strictly on product‑card essentials.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).