Measurement system: Imperial. Surface condition: bright, set case brand: generic, set case Type: metal case, set number of pieces: 8, set size range: 1/4 - 20, 5/16-inch - 18, 3/8 - 16, 716-14, 1/2 - 13, 9/16-12, 5/8 - 11, 3/4 - 10.