This adhesive gun is the industry standard 250ml, 10:1 ratio dispensing gun. The new and improved design prevents adhesive blowback. Can be used with Superior Gold Evolution EXT 250ml. Features Include: Mechanical Advantage 26:1 Manual operation Side Loading Frame - Accurate Cartridge Placement Support Strap - Secure Cartridge Fit Catch Plate - Sintered Steel Wear Compensating Device High Viscosity Materials