The MB104B is a 63mm Stainless Steel Wrap-Around Bullbar Bracket in a Black Finish.
This bracket is also available in various sizes and available in a stainless steel finish:
38mm (MB101SS or MB101B)
45mm (MB102SS or MB102B)
50mm (MB103SS or MB103B)
63mm (MB104SS)
76mm (MB105SS or MB105B)