T&H Poly hub precision stainless steel tips Burr-free. Polished. stainless steel dispense tips with polypropylene Safety hub for a secure fit to barrel reservoirs. 1/4"tips, Fast point-to-point dispensing Smaller gauges ideal for microdots. 1/2"tips: Standard all-around precision dispense tips. 025=1/4".031=5/16".050=1/2".100=1".150=11/2"