Thank you for viewing. This is an Ice Toolz crown race cutting tool. It's a cutting tool for crown race seats, compatible with column diameters of 26.4mm, 27.0mm, and 30.0mm. The spring's reaction force holds the blade in place, making it compact. When I bought it, it didn't support oversized forks, so I was using the Park Tool (CRC-1 CRC-15). This one is almost unused and in like-new condition. The sponge has deteriorated and is partially chipped, but it doesn't affect the main body. Thank you.