The De Neers - C 1x13/16 A, 3/4 Square Drive Hexagon, and Bi Hexagon Socket are “double hex” sockets. It adequately fits around the bolts having hexagonal ends. This 3/4 Square Drive Hexagon and Bi Hexagon Socket can fit in twice different positions than the six-point hex socket. The Hexagon and Bi Hexagon Socket have twelve angles in the bolt end, and it fits nicely in tight spaces. The drive size of this Hexagon and Bi Hexagon Socket is 1x13/16 inches, whereas the size of the square drive hexagon is 3/4 inches. It is one of the most commonly used sockets for turning bolts.
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