b'45 mm BlocksAbout Black Magic Air blocks: see feature pages at beginning of this section. J/Boats3391 3389 3390 33923393 3394 3395 3396Sheave Shackle pin Max line Maximum BreakingPartLength Weight working load loadNo. Description in mm in mm oz g in mm in mm lb kg lb kg3389 Single loop**1 4563 57 3/8 10 1653 750 3306 15002 1/2 2.013390 1 452 1/2 63 3.63 103 3/8101653 750 3306 1500Double loop**3391 Single/swivel1 45100 3/16 53/8 101653 750 3306 15003 15/16 2.79 7933921 454 3/4120 3.3996 3/16 53/8101653 750 3306 1500Single/swivel/becket 3393Double/swivel4543/16106 6.88 1/43/8 10 2425 1100 4850 2200195 613394 Double/swivel/becket1 453 7/8997.272061/46 3/8 102425 1100 4850 2200 3395 Single stand-up*1 453 11/16943.953/810 1653 750 3306 1500112Single runner 1 452 13/162.89825/163/8101653 750 3306 15003396718 *Includes padeye. 5 mm (#10) fasteners, fastener circle: 30 mm (1 3/16"). **Loop not included. 52 Torlon is a registered trademark of Solvay Advanced Polymers, L.L.C.'