Micro Gainz GymPin 5/16 or 3/8" Pin Size, Designed to Allow Additional Olympic Weight Plates to be Added to The Side of Your Cable Machine Weight Stack, Made in The USA

Works very well for adding plates to a weight stack. Not as big as I had imagined. Only long enough to add one 45 lb bounce plate to give you a reference.

Love this product. Simple and works as intended. I can add a lot more weight to my cable training machine so I will never need to buy additional weight plates.