Oxford Products LK402 TerraForce Ground AnchorSold Secure approved to motorcycle Diamond (resists angle grinder attack) Case hardened concrete in steel floor anchor Simple and easy to fit, most DIY stores now supply ready mixed concrete that you just add water to All necessary fittings included 21mm diameter case hardened steel head resists all forms of attack 59mm internal diameter allows all chains to be fitted Fits all cable locks and Oxford chains up to 16mm link diameter