Description The Ortlieb QL3.1 Studs are replacement snap buttons for attaching your QL3.1 pannier to your Quick Rack XL. With the QL3.1 snap buttons, you can replace the buttons of your Quick-Rack XL to attach a bag with the Quick-Lock 3.1 mounting system. Ortlieb product no. E271 Not sure if the Ortlieb QL3.1 Studs is the part you need? We can help! One of the best things about Ortlieb is their huge & ongoing range of spare parts & replacement parts. We have been stocking Ortlieb bags & accessories at Abbotsford Cycles for decades because they make excellent products. And they can last you a lifetime because their hardware can be replaced & they bags can be repaired. The reason we recommend these products is how confident we are that you will never need to buy another Ortlieb! But we know it can be tricky figuring out which part you need, and which is compatible with your bag. So if you are having trouble, get in touch. We have manuals & years of experience finding & fitting the correct parts for Ortlieb bags & racks. And we are confident that your Ortlieb can continue to be the best waterproof bag you can buy!