It's very large compared to the mount I used on the 76csx, redesigned a bit for Montana but certainly fit for the job. Incidentally, the box also contained a 3-pack of Montana anti-glare films, which were not mentioned in the product description. Update: The provision of a locking device seemed a bit odd as the mount itself is secured with 2 easily accessible knurled nuts. A thief can remove both the GPS and mount in less than a minute. I replaced the wing nuts with 4mm nylon-insert locknuts (41 cents for 8 at Lowe's) so it now takes at least a 7mm or 9/32 socket wrench or many minutes with pliers to remove them. Knurled nuts also didn't work for me because I couldn't keep them from loosening on bad roads without further tightening with pliers. The locking feature is a captive Torx screw. Using a Torx screwdriver as a wrench is a good idea as it's easy to replace if lost and few people will carry it around even after they've found it interfering with GPS sharing . After a few months of using this mount I will be increasing the rating to 5 provided the nuts are replaced. For short off-bike rides I use the lock feature and then place the helmet on top of the GPS to make it less visible.
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