Material: chrome vanadium steel. 2 sizes on the spanner, 10mm/0.39" and 12mm/0.47". Overall size: 21 x 1.2 x 0.5cm/8.27" x 0.47" x 0.2" (L*W"T). Double ring spanner wrench with a standard 12-point box end. 12-point box end: Doubles the access angles of a 6-point, preventing round-off and applies force to fasteners.
