The Stronghold Ground Anchor is a device to hold down your motorbike, push bike, trailer or anything else, designed for both residential & commercial use. Attach this to your solid floor or wall with the 5/8 bolts, & then to your bike to remove the possibility of thieves being able to take your possession with locks still attached for removal at their leisure. The anchor has a 16mm thick hardened carbon alloy steel shackle to attach your lock to, which folds flat into the domed anchor when not in use to make it safe to walk & drive over. This Kryptonite anchor comes with two masonry bits (a pilot & final bit) so you only need a drill to complete the fitting. It is approved by the independent tester Thatcham.