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:
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