This bracket uses the front brake caliper bolt to clamp it to the front fork of a Brompton, allowing a dynamo light to mounted there. If your Brompton has a dynamo light and the bracket is broken or inoperative, you can replace it with this one. If you want to wire a dynamo light to your Brompton's front dynamo hub yourself, get this bracket. Its shape extends the light up over the brake caliper but not too high that it will make contact with a Brompton bag mounted to the front carrier block.