Comprehensive socket convertor and bit adaptor set covering drive sizes from 1/4" to 3/4". 6 x socket convertors : 1/2"D (F) to 3/4"D (M), 3/4"D (F) to 1/2"D (M), 3/8"D (F) to 1/2"D (M), 1/2"D (F) to 3/8"D (M), 1/4"D (F) to 3/8"D (M), 3/8"D (F) to 1/4"D (M).5 x bit adaptors: 1/2"D x 10mm Hex, 3/8"D x 10 Hex, 3/8"D x 8mm Hex, 1/4"D x 8mm Hex, 1/4"D x 1/4". 3 x quick chuck socket drivers: 1/4" x 1/4"D, 1/4" x 3/8"D, 1/4" x 1/2"D. 2 x bit holders: 1/4" x 60mm long (one with quick release feature in stainless steel).