"Chrome vanadium steel, matt chrome plated set. Adapters for all socket wrenches have a retaining ball. 6.3 mm 1/4""inside x 10mm 3/8""outer, length 26mm 10mm 3/8""inside x 6.3mm 1/4""outside, length 26.5mm 10mm 3/8""inside x 12.5mm 1/2""outside, length 35.5mm 12.5mm 1/2""inside x 10mm 3/8""outside, length 35.5mm 12.5mm 1/2""inside x 20mm 3/4""outer, length 48mm 20mm 3/4""inside x 12.5mm 1/2""outside, length 46mm Not suitable for air nut removers It is delivered in a completely solid plastic box."