Knox FDC Spanner Wrench Aug. 13, 2018 The Knox FDC Spanner Wrench is a pocket-sized multipurpose tool that can quickly unlock and lock the Knox FDC, Standpipe and Storz Locks.

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Laser’s five-spanner solution lacks the key 17 and 8mm tools, so we couldn’t complete the full test, but what you do get is pretty good. The finish is decent and the 72-tooth ratchet moves easily.

Laser Tools is always innovating and this spanner (8143) is no exception; it has four fastener sizes at each end, two on either side switched via a sliding insert located inside the outer socket.