Removes filters 3-7/16" to 3-3/4" (87mm to 95mm) in diameter. Band will not crush filter. Caution. Do not use with power tools This square drive oil filter wrench is made and used for the hard to reach areas. It's simple to use, place the wrench on the filter, use a 3/8" square drive tool to remove. Made with quality and safety needed for a good performance!