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The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race.
| Model | Sheave in. | Length in. | Weight oz. | Maximum Line | Max Working Load lb. | Breaking Load lb. |
| 404F | 5/8 in | 1 1/8 | 0.33 | 7/32 in | 250 | 1200 |
| 417F | 5/8 in | 1 13/16 | 0.63 | 7/32 in | 250 | 750 |
| 406F | 5/8 in | 1 11/16 | 94 | 7/32 in | 450 | 1200 |
| 408F | 5/8 in | 1 13/16 | 1.44 | 7/32 in | 700 | 1200 |
