I installed it on my GSXS125. the OEM helmet lock is on the tandem seat and it's hard to put the helmet on and a pain in the ass. I bought this lock because the OEM helmet lock is on the Tandem seat. I used a long M6 Hexagon Bolt I had at home and a Nut to hold it from the reverse side. The bolt was very secure. It is easy to install, even for a woman, because only one bolt is needed. I'm not sure about the durability yet, so I'm giving it 4 stars. (???)