Wera Joker Adjustable Self-setting spanner wrench 6004-S. This thing is pretty cool and effective.

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Wera 020100 Joker 6004 Self-setting Wrench, Small

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WERA 6004 Joker L Self-Setting Adjustable Spanner-9/224mm WER020101

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Wera 020150 Joker 6004 VDE Self-setting Wrench, Extra Small

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Wera JOKER 6004 Tool Self-Setting Adjustable Spanner Wrench 4Pce

Wera Tools WERA-05020150001 6004 JOKER 7-10mm INSULATED SELF

Wera Joker Adjustable Self-setting spanner wrench 6004-S. This