Ronstan Track - Series 55 - Luff Groove Track 3025mm, Undrilled ronstan series 45 core block - stand-up swivelling 4 bolt round (3" outlet)

4 bolt round (3" outlet) Big Block

Cannot be zinc plated due to stainless component

• Cylinder lock made from marine grade stainless steel

Fastens using four locking tabs fixed to switch

Ronstan Track - Series 55 - Luff Groove Track 3025mm, Undrilled ronstan series 45 core block - stand-up swivelling 4 bolt round (3" outlet)Convenient track mounting slugs are available for fitting standard profile track to the luff groove of existing masts. Patented system uses low profile cars running on twin races of acetal ball bearings. Cars use the existing luff groove of the mast (no track or installation work required). Ball bearings are captive for easy loading and unloading of cars from mast. They can be easily switched between fully battened and soft luff mainsails. Minimum