#7 is a 3.8mm (5/32?) cut length; Skip Medium * Professional quality chrome finish provides superior rust and corrosion protection * Designed to provide a smooth cut and a show quality finish * Fits Wahl KM2, Switchblade, Storm and Storm II, ProFicient and Oster* and Andis* detachable style clippers. * 100-Percent quality guaranteed to cut fur the first time they are used; Made in USA