Large and rugged, our 4-Prong and Star knobs are excellent for applications requiring high torque or heavy-duty clamping. Molded of thermoplastic, our knobs are four times more impact resistant than similar phenolic knobs. The smooth lines and rounded edges make the Star Knob a popular choice in consumer products, while the 4-Prong is known for its stout appearance and easy grip. Inserts are available as both male and female, blind or thru. Metric and locking are also standard. Insert materials include steel, brass, stainless, and aluminum.