Oster comb attachments are designed to fit 'flat-faced' fine or medium blades. They are quick and easy to use and provide a convenient way of achieving specific uniform cutting heights from 1/8" to 1-1/4". Before attempting to use a comb attachment, please ensure the coat has been thoroughly brushed and combed to remove any mats and tangles. Failure to do so will cause the comb to snag, hindering the clippers' ability to cut. Oster comb attachments are compatible with most other leading brands excluding Aesculap.