Ceramic ferules Type D0 D1 D2 H A UF10 (3/8) 10.6 17 13.4 9.9 5.7 UF13 (1/2) 13.5 20.5 16.6 11.5 6.9 UF16(5/8) 16.6 25.5 20.8 12.8 9.1 UF19(3/4) 20.3 32 26.5 17.5 13 UF22 (7/8) 24 36.6 30.8 18.6 14