The TandemKross KrossPin Receiver Pins are made from galvanized steel which are highly durable. They feature a spring-loaded ball detent that holds the pins securely in place inside the sub-assembly. The KrossPins are designed to be easily inserted or removed for working on your rifle. Put a stop to lost receiver cross pins with the new upgraded PC Carbine "KrossPins" from TandemKross! FeaturesUpgraded pins won't fall out when working on your rifleA steel pin is highly durableSpring-loaded ball detent holds pin in place securely, installs easilyIncludes two Pins