This tool will help you remove MOST . NOT ALL...Please be sure to read all details on this product before buying. Product is not a one size fits all. A Cache’ hidden (sometime called recessed) aerator can be measured by ‘eyeball’ size comparison: If the size of a dime = Tom Thumb (TT) If the size of a penny = Tiny Junior (TJ) If the size of a nickel = Junior (JU) If the size of a quarter = Standard (ST)