The folks at Problem Solvers have you covered in so many different ways, the newest is those are Bubs. Bubs are lightweight, 10mm long plugs that replace your M5 bolts on your frame. Whether you have lost the original bolts, simply do not use them, or are looking for something a little more low profile, the Bubs are the perfect solution. They are made from a durable rubber and help protect the inside of your frame and your frame's threads for years to come.
Bubs are not only great for protecting your frame from unwanted debris. They will also protect your frame bags from the abrasion of unused M5 bolts. Every so often a protect comes along and you wonder how you ever lived without it.
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