Used to connect the Wedge Mount to your pannier rack. With two extra wedges and a Puck Sak, you can use one set of panniers on two bikes. Puck Sak includes 8 blue anodized pucks, 8 black anodized stainless steel black washers, and 16 black anodized screws. It is no longer necessary to order a special puck for SW Motech racks, the latest version of the standard puck fits SW Motech racks. Check the Fitment Page for additional rack information. Note: these are included with the pannier kits, so it is only necessary to order them separately if you want to setup a mounting system on a second bike.