U-Shaped Stainless Steel Swivels, comes in 5 sizes.
Made of Stainless Steel English Style Swivels Good Quality Well Polished.
 
SSE805 - XX large ( use for eagle like birds)
Size is  7 cm x  3.1  cm wide. 

SSE804 - XL ( can be use for small eagles like birds owls)
Size is 5.08 cm x  2.4 cm wide. 

SSE803 - L
Size is  4.5 cm x 1.8 cm wide. 

SSE802- M
Size is 4 cm x 1.6 cm wide.

SSE801 -Small ( can be use for kesteral like birds)
Size is 3.5 cm x   1.5 cm wide.