【For Combination Changes Only】 Designed for changing the combination on compatible mechanical safe locks. Current combination must be known before use. This is a change key only and is not an opening key or bypass tool. 【Confirmed Compatibility】 Compatible with S&G / Sargent & Greenleaf 6600 series 3-wheel mechanical combination locks, 6700 series 3-wheel mechanical combination locks, 8500 series mechanical spin dial locks, and Model 2937. Please verify your lock model before ordering. 【Durable Metal Construction】 Made from durable metal and precision manufactured for reliable fit and smooth operation in compatible locks. Ideal as a replacement or spare change key for routine lock servicing. 【Instructions Included】 Includes step-by-step instructions to help guide the combination change process. For safety, always test the new combination with the safe door open before closing and locking. 【Aftermarket Replacement Part】 Includes 1 replacement U8-style change key and instruction sheet., Manufacturer: Brass hunter