Used, as everyone knows. A gem that came out while cleaning. Manufacturer: Original Product Name: Crab-eye Special Tool Also for Union Japan Oil Filter Wrench 65 Oil Filter Wrench Removal Assist Tool Diameter Sizes: 1. Crab-eye: 49mm, 55mm 2. Filter Wrench: Union Japan 65 only How to Use: 1. Remove the filter from the interchangeable lens and turn the crab-eye with the 2 protrusions. 2. Clamp the oil filter wrench and turn. Photo ①: Wrench engagement surface → Insert the claws into the crab-eye holes and turn. Fit the wrench, and use the bolts x 2 and metal fittings to turn the assist tool wrench. Photo ②: Top surface, the surface you see when operating Interchangeable lenses for film SLR cameras. If you use a special tool called a crab-eye tool, you can disassemble it for cleaning, but unfortunately, it is not generally available. So, I made my own and used it with Olympus Zuiko lenses. However, I got rid of the entire SLR camera set, so I have no use for it anymore, and I'm going to give it away. Delivered disassembled, with the two crab-eye claws that are used by fixing them with two bolts on the handle. If you have two hex bolt tightening spanners, monkey wrenches, etc., you can easily fix it, so fix it to fit the width of the lens you use and use it.