Except for rollers, Is the 22mm all stainless. Are the ball bearings sealed. I want to use it off shore

The best I can tell they are all stainless except rollers. I can't answer about the bearings but I have used mine on my Hobie 16 for years in a saltwater environment and so far they have performed flawlessly. Hope this helps.

What is the diameter of the mounting holes?

The mounting holes are .20" or 5.17mm

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⚓ Elevate your sailing game with precision and ease!

VERSATILE FIT - Perfect for sailboards, dinghies, and light control lines across all boat sizes
SMOOTH OPERATOR - Low-friction technology ensures effortless sail adjustments every time
COMPACT POWERHOUSE - 22mm micro blocks engineered for maximum efficiency in minimal space
FEATHERWEIGHT CHAMPION - Lightweight design reduces load without compromising strength
DURABILITY MEETS PERFORMANCE - Premium materials built to withstand marine environments and keep you ahead

The HARKEN Premium Sailing 22mm Boat Blocks are compact, lightweight, and low-friction micro blocks designed for optimal performance on sailboards, dinghies, and light control lines. Engineered for smooth operation and durability, they enhance sailing efficiency across a variety of boat sizes.

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