This cool add-on item was designed by Ground Control to work on their FSK frames, but they will work other brands using one-piece 8mm axles as well. Made from durable UHMW, you can slide easy and fast. Comes in two sizes and includes longer axles to replace existing hardware.  

• Price is for Two Grind Plates & Hardware
• 84mm Thick and 28mm Tall
• Includes Longer 8mm x 44mm One-Piece Mounting Axles
• Two Sizes:
• MD designed for MD 240mm Ground Control 80mmHD Frames
• LG designed for LG 270mm Ground Control 80mmHD Frames