Set includes 5 types of countersunk wood screws and 2 types of round head wood screws. Countersunk screws are 13 pieces 2.7 x 16 mm, 13 pieces 3.1 x 20 mm, 7 pieces 3.5 x 25 mm, 7 pieces 3.8 x 32 mm, 7 pieces 4.1 x 38 mm. Round wood screws come with 13 x 0.6 inches (3.1 x 16 mm), and 7 x 1.0 inches (3.5 x 25 mm).