Harken Premium Sailing 57mm HL Black Magic Runner Boat Block, 57mm, Part 3224

The entire line of black magic airblocks has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. Carrying some of the highest loads imposed by running rigging, these strong, lightweight blocks feature torlon; roller bearings housed in a center cage. Rollers stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings.

• Redesigned with a sleek look the Black Magic Air blocks has their same unique, performance-packed engineering as ever.
• 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
• Foam padded Block Socks easily install over Air Runner blocks to protect your blocks, deck, and crew.
• Sheave Ø 2 1/4 in 57 mm Length 3 3/8 in 86 mm Weight 4.42 oz 125 g Clevis Pin Ø 3/8 in 10 mm Max Line Ø 1/2 in 12 mm