Ronstan Series 55 BB Single Orbit Block - Becket, Swivel Shackle Head Rope Size:10 mm It has a 30mm hole

It has a 30mm hole to accommodate the neck of the squeegee

Collinite No

This is especially important on engines with flexible rubber impellers

please refer to Whale Manual Bilge Selection Table

Ronstan Series 55 BB Single Orbit Block - Becket, Swivel Shackle Head Rope Size:10 mm It has a 30mm holeRonstan Series 55 BB Single Orbit Block Becket, Swivel Shackle Head RF55110 Ultra Lightweight Low friction 2 stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating swivel shackle head for unlimited block rotation Stainless steel shackle head and compatibility with sharp fixing points Ultra low profile integrated becket Materials Ball bearings: High compression strength carbon black acetal