SBDs MAGNETIC Pin, Tensile (3/8" Dia x 5.5" Locking) Universal Weight Stack Heavy Duty SELECTOR KEY - Deluxe Aluminum T Handle Knob - World Class Hitch PINS - Round Jumbo Knob with Strong magnetic insert. Please make sure you are ordering the correct Diameter and length pin for your weight stack. When measure, pin should go through stack, selector stem and well into the other half of the plate. The pin should cover up to at least 75% of the stack depth. Magnetic pin lock space measure true to length. Please make sure you are ordering the correct length pin for your weight stack. When measure, pin should go through stack, selector stem and well into the other half of the plate. The pin should cover up to at least 75% of the stack depth. Magnetic pin lock space measure true to length. These PINS work only on bare metallic PLATES. If you have a weight stack with rubber Insulation / Encapsulation, please use standard ball valve locking pins. The greatest advantage of using Magnetic Quick Release PINS is twofold: Firstly, it eliminates the need for other labor-intensive fastening combinations such as clevis and cotter pins, a pin and retaining, spring-loaded detent steel ball. Once fully inserted the strong Ring magnet locks the pin into the application. It functions as a pin and cotter all in one. Secondly, the locking length of the PIN is flexible as it needs only 75% of the length Penetration into the application Plate. Similarl SBDs MAGNETIC Pin, Tensile (3/8" Dia x 5.5" Locking) Universal Weight Stack Heavy Duty SELECTOR KEY - Deluxe Aluminum T Handle Knob - World Class Hitch PINS -