Ring to be closed with hex screws.
Inner size Ø 34 to 45mm; outer size is always Ø 65mm.

Width 15 mm.
Weight 190 to 270g.

Width 30 mm.
Weight 380 to 500g.

Width 40 mm.
Weight 480 to 700g.

Width 50 mm.
Weight 650 to 900g.

Width 60 mm.
Weight 780 to 1050g.