The B63 bracket is commonly used in formula and prototype applications where there are no in-line adjusters on the lap belts. This bracket incorporates a 3 bar slide into the bracket allowing you to adjust the length at the bolt in location. Note: you cannot adjust length once a driver is in the car. Dimensions are 4mm thick, 68x72mm with a 13mm (1/2") hole. There is a slight 10degree bend so that this bracket can be bolted directly to a fl at surface and leave room for webbing wrapped into it. This bracket can only be wrapped in. FIA and 16.1 approved. For SFI 16.5 Approval, use B63NC.