The Ko-ken RS2300XZ/9 1/4" Sq. Dr. Socket Set is a Z-Series collection of 9 semi-deep, 6-point sockets, designed for superior durability and precision. Covering sizes from 5.5mm to 14mm, the set includes sockets in the following sizes: 5.5, 6, 7, 8, 10, 11, 12, 13, and 14mm. The Z-Series construction enhances strength and resistance to wear, while the semi-deep design provides access to deeper fasteners. All sockets are mounted on a 200mm rail for organized storage and easy access.