https://midstatefirearms.com/product/ar15-anti-rotation-anti-walk-trigger-hammer-pins-set/

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AR 15 non-rotating / anti-walk trigger and hammer pins. These AR 15 trigger and hammer pins will stay in place unlike some standard pins that tend to slide out of the receiver over time.  Great addition to your lpk / lower parts kit or drop in trigger assembly.

• Easy installation, tapered tip included to install pins in place without disassembling your lower.
• wrench included
• Pins lock securely in place, great for added reliability. 
• Made in USA