An adjustable spanner (UK, and most other English-speaking countries), adjustable wrench (US and Canada) or a shifter (Australia) is an open-end wrench with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner. Several other names are in use, including the US trademark crescent wrench.

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  1. Lazyfaire

    W.A.R. Adjustable Upper

    Very interesting product. This is an adjustable upper that you can turn the switch to turn off the blowback gases. Not inexpensive but certainly adds to a quality build. From Innovative Arms Warfighter Adjustable Upper Receiver
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