This is a keyholder from Butler Verner Sails. I purchased it on Rakuten previously, but it didn't match my image, so I haven't used it and have kept it in storage. Here's the website description: A unique keyholder featuring hardware modeled after a tool (plug gap tool) used to measure the gap in a motorcycle's spark plug. The original Butler logo is engraved. Available in three colors: brass, metal, and matte black. Total length 13.5cm x W (width) 1.8cm x D (thickness) 2.5cm