... jet sizes to meet your TFA (Total Flow Area) requirements. 5. The bits are used in many different formations of the ... . Sizes:3 7/8, 3 5/8,4 1/2,4 5/8,5 1/2,6 ,6 1/2,6 3/4,7 7/8 ... ,8 1/2,8 3/4,9 1/2,9 5 ... /8,9 7/8,10 5/8,12 1/4 ... ,13 3/4,14 3/4,14 5/8 ... ,16,17 1/2,20,22,23 ,24,269. Models: HA,HJ ...