The U adaptor allows blocks with 3/8 in (10 mm) posts to be attached to swivel bases or to other blocks with 3/8 in (10 mm) posts.
Shackle pin Ø (mm) 5 mm
Weight (g) 13.6 g
A (mm) 12 mm
B (mm) 11 mm
Maximum working load (kg) 567 kg
Breaking load (kg) 1134 kg