Kel-F hub (KF) needles can be used with Luer Tip (LT) and PTFE Luer Lock (TLL) syringes and connectors. Standard needle length is 2" / 51 mm. Kel-F hub (KF) needles are available in convenient six packs. Custom lengths and point styles are available. These needles are available from 10 - 31 gauge.