
Box end designed for access to tight spots. Sizes comparable to standard combination wrenches. 3/8" to 3/4" needs only 5-degree movement, 5/16" only 6-degree. Moves fastener along any length threaded rod without ever removing wrench. Service Drive box end virtually eliminates fastener rounding. All metal construction, fully hardened with nickel-chrome plated mirror finish. Meets or exceeds ANSI, DIN and FED. torque specifications.
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I definitely prefer these over conventional box end wrenches. The ratcheting is a real time saver, and can provide more torque than you would expect.