Single block with becket for sailboat runner
1992 Harken

Black Magic® Air Runners® are strong, lightweight blocks with extremely free-rolling sheaves. Blocks feature Torlon® roller bearings in a center cage for strength. Sideload bearing strips dampen rig vibration.
Integrated sideplate bails and recessed cotter key help produce a smooth design that won't snag lifelines.
Heads are offered with parallel/perpendicular shackles. Tangs attach turnbuckles, toggles, and other fittings. No tools required for installation.
Foam padded Block Socks easily install over Air Runners® to protect your blocks, deck, and crew.