"FLAT MOUNT" IS DESIGNED FOR THE INSERTS ON A RIFFE EURO OR FOR MOUNTING ON OTHER FLAT BARREL WOOD GUNS. "RADIAL MOUNT" IS DESIGNED FOR MOUNTING RIFFE COMPETIOR, STANDARD, AND MID-HANDLE GUNS OR OTHER ROUND BARREL SPEARGUNS. A low-profile design made of composite materials (Nylon-Fiberglass) including heat treated aluminum parts with a hard anodized surface. Featuring a clutch type drag with 4 positions activated by a lever on the side of the reel. The spool size is the same as RIFFE's Vertical CFN REEL accepting up to 60 meters (200 ft) x 272 kg (600 lb.) Spectra Line. Mounts on all RIFFE spearguns as well as other manufacturers that feature similar barrel shapes. Fits on flat and radial gun stocks with proper mounts.