With this rock-solid design, any #6, #8, or #10 machine screw becomes a camera-mounting point. Simply remove the screw and install the spud with a longer screw, and you have a camera hard point for the Nflightcam Exterior Ball-Head Mount. The rubber footing on this stainless steel spud protects your plane from scratches. While the Nflightcam Exterior Ball-Head Mount is a complete kit that includes a spud, you may want to purchase extra spud mounts to avoid taking them on and off every time you want to change mounting points on your plane. What is included: 1 Nflightcam Surface Spud. Compatible with Nflightcam Exterior Ball-Head Mount. NOT compatible with Nflightcam Exterior Billet Mount.