Ronstan Series 30 BB Double Orbit Block - Non-swivel Shackle Head Rope Size:8 mm Simple to install-built in Automatic

Simple to install-built in Automatic sensor - no need to fit a separate bilge switch

Use above and below the waterline

Swivel Shackle Head - RF567

Ronstan Series 40 All Purpose Single Utility Block - Universal Head - RF41100

please refer to

Ronstan Series 30 BB Double Orbit Block - Non-swivel Shackle Head Rope Size:8 mm Simple to install-built in AutomaticRonstan Series 30 Ball Bearing Double Orbit Block, Non swivel Shackle Head RF35202 Lightweight Highest working load in its class Secure, versatile and secure attachment Low profile and compact Applications Mainsheet systems and spinnaker sheets on dinghies to 5m (16ft) Halyard, vang and backstay applications on boats to 5m (16ft) Control line applications on larger yachts Materials Sheave: High compression strength carbon black Acetal Ball Bearings: