Mainsheet Cam Cleat: A swivel base for mainsheet. Includes a swivel base, bullseyes fairlead, and standard cam cleat. The base rotates 360 degrees making it easy to cleat an un-cleat from any angle. Plastic bullseye fairlead Line diameter: Min 1/8" - Max 1 1/32 Fasteners not included Fasteners (mm) - 5 FH mm Fasteners (in)#10 FH in Fastener spacing (in)1 1/32 in Fastener spacing (mm)26 mm