Schaefer Single Block w/ Swivel Shackle Triple Sheave(45mm) this is the same shackle

this is the same shackle that has had its place in every major yachting event since its creation

This fitting is available for 4" pole fittings

NO EXTRA REINFORCING ON THE SEAT PANELS

Schaefer Bent Chainplate w/ 1/2" Pin Hole

Schaefer Single Block w/ Swivel Shackle Triple Sheave(45mm) this is the same shackleProduct Description Schaefer Single Block w Swivel Shackle Single Block swivels for clear, clean leads. For control lines on boats to 18'. Swivel allows varying line leads. Specifications: Sheave Dia.: 3 4 in. (19 mm) Sheave Width: 11 32 in. (9 mm) Pin Dia.: 3 16 in. (5 mm) Thickness: 15 32 in. (12 mm) Width: 7 8 in. (22 mm) Length: 2 19 32 in. (66 mm) SWL: 750 lbs. (340 kg) Weight: 1 oz. (28 g) Max Line: 1 4 in. (6 mm)