57mm Carbo Air Block with Swivel. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Specifications include: Sheave: 57mm / 2-1/4in; Length: 110mm / 4-5/16in; Weight: 87g / 3.1oz; Shackle pin: 5mm / 3/16in; Maximum line: 10mm / 3/8in; Maximum working load: 359kg / 792lb; Breaking load: 1079kg / 2380lb. Material: Plastic. Includes swivel attachment. Ideal for sailing, rigging, and boating hardware applications.
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