Designed to convert ProBEAM bullet style LED turn signal inserts to flat style inserts. The Flat Turn Signal Adapters attach to the ProBEAM bullet LED turn signal using a modular tab design. Made from light weight aluminum, the Flat Turn Signal Adapter tabs bend to secure the LED cluster to the adapter. The assembled unit can then be installed inside the Harley-Davidson OEM flat turn signal housing with ProBEAM Flat Turn Signal Lenses (sold separately) using the stock screws.