25 cm saw specific guide drive 1/4 "PM 56 drive links 1.1 mm Suitable for the following Stihl MSA160 MSA 160 The Guide Rail fits only to be used in association with specific This, and standard 1/4 1.1 mm Chain. We suggest you choose you at this point our blade sets: 18129AR0179X and 18130AR0180X This guide rail is durable and of high quality. The rails have a roll pattern.