Set. with T and I connectors for vacuum hoses. for windshield washer hoses, etc. Also transition connectors large-small. 1/8"x 1/8" (3.17x3.17mm) straight. 3/16"x 3/16" (4.8x4.8mm) straight. 1/4"x 1/4" (6.3mmx6.3mm) straight. 5/32"x5/32"x5/32" (3.9x3.9x3.9mm) T-joint. 3/8"x 3/8" (9.5x9.5mm) straight. 1/4"x 3/16" (6.3x4.8mm) transition. 1/8"x1/8"x1/8" (3.17x3.17x3.17mm) T-ext. 5/16" x 5/16" (7.9x7.9mm) straight. 3/16"x3/16"x3/16" (4.8x4.8x4.8mm) T-ext. 1/4"x1/4"x1/4" (6.3x6.3x6.3mm) T-ext. 3/8"x 3/8"x3/8" (9.5x9.5x9.5mm) T-ext. 3/8" x 1/4" (9.5x6.3mm) transition.