9/10 security rating when used with a similar or higher rated lock. The Halfords Advanced Ground Anchor is perfect for keeping your bike secure whilst at home. This anchor acts as a fixed object for you to secure your bike to with the use of a chain or D lock. This anchor features a large, weather treated shackle, as well as 4 masonry screws and metal plugs. Sep 28, 2018 · Ground anchors are a superb anti-theft device for your motorcycle or scooter. Multiple locks won’t stop your bike being lifted into a van by a few scrotes – but if your motorcycle is chained to a ground anchor, it’ll be significantly harder to steal.