6oz manual sealant gun. The Semco model 850 gun is a hand-operated, high quality dispensing gun designed to accept Semco disposable cartridges or Semkit packages. It is excellent for the "in-field" application of sealants, adhesives, and other materials. A threaded retainer provides a tight fit into the ratchet handle, permitting uninterrupted operation. It also allows for the quick and easy replacement of cartridges. Each package contains the dispenser handle and a metal retainer. 2 lbs (1Kg) shipping weight.