Today Only Ko-ken Tools 1/4 Sq. Dr. Socket 11mm 12 point Length 50mm

Metric, drive, 12 Point, Deep, Chrome Hand Sockets.12-point (double-hexagonal) configurations: 12-point sockets can be used on square nuts and fasteners, and also offer double the amount of starting points. The design is normally only used for general purpose applications because it can greatly increase the chance of rounding or slipping off a nut or fastener. 12-points are preferred however because that are faster and more versatile to use than standard 6-points.

Product Dimension (Refer Line Drawing Image):