Product details: donut half product data: o. D size wall thickness bend radius 2" 2mm 1. 88 2-1/2" 2mm 2. 13 3" 2mm 2. 38 3-1/2" 2mm 2. 56 4" 2mm 2. 81 welded donut product data: o. D size wall thickness bend radius 2" 2mm 1. 88 2-1/2" 2mm 2. 13 3" 2mm 2. 38 3-1/2" 2mm 2. 56 4" 2mm 2. 81