1.[PROFESSIONAL ASSISTANT]The HVAC Core Removal Tools for removing and installing valve cores in charged systems. Replace Leaking valve cores quickly and easily. Dual size 1/4" & 5/16" SAE valve core remover and install tool can work on charge systems of R410, R22, R12, R407, R404, R32, R600 A/C air condition system, etc. (Not suitable for Automotive AC). 2.[WELL-MADE] The HVAC Valve Core Removal Installer Tool Kit is made of heavy duty solid brass, which is durable and won't rust easily, and the metal knobs are in anti-slip knurling design, which is durable and reliable. R410a, R32 Adapter (1/4" male SAE to 5/16"female SAE) is very convenient for daily use. 3.[TIME-SAVING]This AC Schrader Valve Core Removal Tool makes it easy to insert it into the inner valve, an external bypass port design can remove the valve cores easily, save hours of evacuation and charging time. 4.[PACKAGE INCLUDE]HVAC Core Removal Tool Kit include 1pc x 1/4" & 5/16" Valve Core Remover Installer Tool, 1pc x R410 R32 Brass Adapter, 10pcs x 5V1 Valve Cores, 1pc x classic Valve Core Remover.