LIGHTECH 9A4M Aprilia RSV4 (09/20) Engine Screws KitLIGHTECH Engine Bolts Kit for Aprilia RSV4. Lightech offers a wide range of screw kits for the engine, the frame, the fairing but also for the windscreen and the tank cap (where these screws are not already included in the fairing kit). The screws are produced in Ergal 7075, a very resistant but at the same time very light material. The screws are then anodized to make them even more resistant. This engine kit in particular is made up of 30 pieces.