Super flat V6 socket set, 3/8 inch, 18 parts. Supplied = assembled. External hex = 8 - 22 mm. Weight = 1.3 kg. Width in inches = 3/8. Half the insert is countersunk in the ratchet, creating more space in confined work areas. Because there is no starting chamfer, the insert can be placed directly on the hexagonal screw head - even when screw connections are extremely flat - and gives the user a high transmission of force. Direct placement on the screw connection prevents damage when screwing. Flat insert profile - direct placement on the nut/screw connection. Robust, solid steel reversible ratchet with clockwise and anti-clockwise operation.