This syringe is easy to use and you merely have to set the dosage, mount the bottle and you are ready to give your birds a vaccination. The maximum dosage is 2 cc, but is easy to adjust down to .10 cc in graduations of .01 cc/ml. Squeeze the trigger and turn the dial to the dosage for the product you are using. Heavy duty plastic, light weight and a stainless steel nozzle to slip the needle on. Needles are not included. Includes full directions. Easy to use, easy to clean and no need to keep filling syringes. ADJUSTABLE BOTTLE MOUNT SYRINGE