Single swivel ball bearing block with shackle. Extremely light, the sheaves run on twin races of Delrin® ball bearings for minimum friction. Usually employed on small boat for traveller regulations, boom vangs and barber haulers. Delrin® cheeks, sheave and ball bearings. Stainless steel (AISI 316) load straps. Sheave diameter: 28 mm, Maximum line size: 8 mm, Overall height: 51 mm, Weight: 24 g, Breaking load: 600 kg, Maximum working load: 150 kg, Holes distance: 55 mm, Hole diameter: 5 mm.