Pro-Set Adhesives 300-x Manual Gun. The manually operated, two-component dispenser is used with PRO-SET Adhesive cartridge sets to apply adhesive quickly, cleanly and accurately. The handle and trigger are die cast aluminum and shaped for comfortable operation. A 26:1 trigger ratio dispenses the high-viscosity adhesive with ease and the gun's heavy-duty construction assures precise adhesive application and long operating life. This is for Professional use Only!