Attwood Portable Clamp-On Boat Bow and Stern Lights The Attwood Portable Clamp-On Boat Bow and Stern Lights feature a water-resistant, shatterproof polycarbonate lens. They are composed of shock-proof composite housing and have durable, portable LED navigation light engines. With a heavy-duty C-Clamp and Kayak Pad mounting option, these clamp-on boat lights and stern lights are built to last in the harshest marine conditions. Features Water-Resistant Bow and Stern Navigation Lights Shatterproof