Faithfull sockets have a hexagon design that gives an accurate fit on both nuts and bolts and the chamfered end allows easy nut location and entry. Size 15mm Hexagon. The FAISOC3815 Hexagon Socket has the following specifications.
Faithfull Hexagon Socket 3/8in Drive 23mm
Faithfull Hexagon Socket 1/2in Drive 23mm
Faithfull Hexagon Socket 1/2in Drive 14mm
Faithfull Hexagon Socket 1/2in Drive 28mm
Faithfull Hexagon Socket 3/8in Drive 14mm
Faithfull Hexagon Socket 1/2in Drive 9mm