Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100] Marine Navigation & Instruments | NMEA Cables & Sensors it has a built-in flasher

it has a built-in flasher and displays speed data

nighttime red backlighting and high-contrast text and graphics

Grade 316 Stainless Steel

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself

Canadian and international marine channels and 10 NOAA weather channels

Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100] Marine Navigation & Instruments | NMEA Cables & Sensors it has a built-in flasherSeries 30 Utility Ball Bearing Block Single, Swivel Shackle Head Features: Low friction 2 stage ball bearing system provides consistent performance over the full working load range. High static and dynamic load capacity. Light weight Versatile head fittings Product Information: Sheaves running on Acetal or Torlon ball bearings provide high performance & low friction. The 2 stage ball bearing system provides consistent performance over the full load