Treadlife Fitness Universal Weight Stack Replacement Pin (Heavy Duty) 

SPECS:

• MAGNETIC: Magnetic pin sticks to any standard cast iron stack (unless your stack is the old cheap plastic material, this will stick)
• MATERIAL: Aluminum alloy material. The special anti-rust and anti-corrosion design makes it more durable.
• INCLUDED: Blue Aluminum, Heavy Duty, 5.5" Pin Insert Universal Weight Stack Pin! Come with Anti-Theft Locking Cable!
• SIZE: 3/8" Diameter Pin x 5 1/2" Pin Penetration