Ronstan Series 20 Ball Bearing Block - Double, In-Line Jacket Black Polymer Top with Clear

Black Polymer Top with Clear Fluted Lens & Frosted Globe

Another simple twist of the knob releases the "lock" and with an upward tug

Length: 48mm / 1-7/8in

and steel-reinforced seals

Stainless mesh screen collects rust and scale

Ronstan Series 20 Ball Bearing Block - Double, In-Line Jacket Black Polymer Top with ClearSeries 20 Ball Bearing Block Double, In Line Features: Low friction High static and dynamic load capacity Lightweight Precision molded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Applications: Dinghy control lines Dinghy vangs Cunninghams Traveller controls Dinghy barber haulers Spinnaker pole launching systems Materials: Stainless Steel ball bearings UV stabilized Acetal sheave Grade 316