Sizing Niche Prestressing Generic horizontal niche Generic vertical niche Niche type: HorizontalVertical Diameter and number of ropes: 12.7 mm – 2 a 312.7 mm – 4 a 712.7 mm – 8 a 1212.7 mm – 13 a 2212.7 mm – 23 a 31————————-15.2 mm – 2 a 315.2 mm – 4 a 615.2 mm – 7 a 915.2 mm – 10 a 1515.2 mm – 16 a 22 α angle value in degrees (only integer values)
