Barton Marine SkyLocks 800. The clever design and construction of the locking cams means the control line will never allow loads to drop even when accidentally released. Designed for use in conjunction with 3:1 or 4:1 purchase systems.Can be used for commercial and leisure marine operations including a davit hoist system to lift dinghies outboards provisions and equipment on board especially useful when short-handed. Specifications for Barton Marine SkyLock 800: Manufacturer: Barton Marine Color: Black Package Contents: Barton Marine SkyLock 800 Barton Marine N09421: SkyLocks 800