This is a used Snap-On CTLMAG-BOOT, this is a magnetic book that attaches to Snap-On 14.4v batteries used in various cordless tools.  This listing is ONLY for the boot as pictured.

The boot mentions being compatible with CTB8172 batteries but it also works with CTB8174 batteries too.

Listing Includes: 

• Snap On CTLMAG-BOOT Magnetic Battery Boot