The Shorty Knurl just got customized! The specifications for this mod are the same as the SZCM

• C145 Copper/Cerekote/Knurl • 8-point Clutch Contact for maximum consistency and efficiency • Short switch with venting for safety in the event of battery failure • Silver plated adjustable contacts for compatibility with all 510 atomizers including a 12mm reverse threaded contact for positive battery pressure • Efficiency of >99% at 0.1 ohms for extremely low voltage drop even on the lowest resistance builds