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Lightweight, low-friction wire blocks guide wire halyards and high-strength control lines on boats of all sizes. High-strength composite bearings support axial loads. Hard Lube-anodized, PTFE-impregnated washers for strength and corrosion resistance. 1.00" wire blocks feature low-friction thrust washers. 1.50" and 2.00" wire blocks have lateral ball bearings between disc and cheek to minimize friction from angled lines.