You need to measure the diameter of the bolt body - M - and the length of the bolt - not including the head. (For example, the bolt M5x20 has a body diameter of 5mm and a length of 20mm - not including the head)
Non-Magnetic Bolts - If your bolt is non-magnetic, replace it with our high tensile 10.9 steel Bolt
Bolts with Exposed Head - For bolts where the head is exposed - for example not sitting in a recess - and anyone could use a pair of pliers to get a grip on the head, we offer Security/Pan/Dome/Round head bolts (Linsenkopf) on which pliers or vice simply "slip off"
Tip!- In case you get stuck picking the right products, we have created our super-user-friendly Selection Helper - a great tool to quickly get everything you need to secure your bike.