Harken Air Runner® Black Magic® Single 57 mm Cat. No. HAR 3039 Weight 1 lbs
3039 BLK-57MM HL RUN
Black Magic® Air Runners® are strong, lightweight blocks with
free-rolling sheaves. Blocks feature Torlon® roller bearings in a
center cage for strength. Sideload bearing strips dampen rig vibration.
Integral sideplate bails and recessed cotter key help produce a smooth
design that won’t snag lifelines.