Designed for plumbers, this kit contains pipe tap sizes for pipe through 2-1/4" Set includes 1 of each: 565104 (3/4"), 565106 (7/8"), 565110 (1-1/8"), 565119 (1-1/2"), 565123(1-3/4"), 565129(2-1/4"), 565180 (M24R, 1/4 Round), 565185 (M45P, 7/16 Hex) ...