RAM® Pin-Lock™ 交換用4ピンキー（D/Eサイズソケットアーム用）

Took me a minute to line up the pin slots, but once I did it clicked right into the socket arm—no wobble at all. The metal feels solid, and the 4-pin design gives a secure lock without any frustrating play.

Finally got the replacement key knob and it matched the existing Pin-Lock nut perfectly on my D-size arm. Fits snug without any wobble. Exactly what I needed for a quick repair.

I was a little worried about getting the right fit, but the 4-pin design matched perfectly with my existing D-size arm. It locks in securely and feels just as sturdy as the original. Now I can finally stop using that zip tie as a temporary fix.