Dial-A-Matic syringe is a tried and true, heavy-duty 50 ml syringe featuring excellent balance, superior O-Ring plunger, and heavy die-cast handle. Strong, crystal clear Poly-Carb barrel will not stain, warp, or discolor, yet may be sterilized, and barrel has metal threads, eliminating stripping, a common problem with plastic-threaded barrels. Dosage adjustable from 1 to 5 ml with a simple twist of a dial.