The MG Chemicals 8DG-450-2-1 is a manual dispensing gun made of a solid plastic casing and steel piston arms, for use with 400mL 1:1 dual cartridge systems. It features an easy slide-in / slide-out cartridge insertion system that facilitates cartridge installation in seconds. The trigger-activated control provides a steady incremental flow of hardener and resin through an optional static mixer that can be attached to the head of the cartridge. Simply pull the trigger and obtain the perfect mix ratio of material needed to complete your task.