This aviation oil filter cutter will open any size oil filter canisters for your inspection. To use the tool, place the filter in a vice, attach the tool to the top of the filter, & rotate 4 to 6 turns to open the canister. Cutting wheel will stay sharp for about 50 uses, and is easily replaced when dull.The tool is made from 6061 aluminum anodized finish. The tool is ready to use on any oil filter with a male or female thread.