The Swerve 21700 Mech Mod by Purge Mods is both a real looker AND heavy hitting piece of hardware. The Swerve tapers to 28mm at the top which ensures for a minimum voltage drop and maximum output and features some exquisite CNC machine. Designed for 21700/20700/18650 batteries. The button housing is comprised of 3 very strong magnets which ensure a comfortable throw and one hell of a hit and one beefy copper contact pin. The threading on each mod is flawless and they are weighty too, these mods ooze high-end quality. This mod comes with a rugged, hard shell carry case.