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The ASA housing and lens are sealed against the elements for years of trouble-free operation
Attachment loop accommodates webbing up to 2" (5 cm) in width
Harken's 40mm Zircon Double Block
the Clear Start™ range offers clean modern styling without sacrificing usability
1-Year Limited Warranty
Ronstan Series 40 All Purpose Block - Double Block - Full Swivel Head Boat Nacra 17 The ASA housing and lensSeries 40 All Purpose Block Double Block Full Swivel Head All purpose (AP) blocks are a great all around solution. Self lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Head swivels freely. Features: Exceptionally