Wera makes great tools. This one has problems.
We like a lot of Wera’s design work, but our experience is not uniformly positive: the Zyklop set earned a mixed verdict after its ratchet failed. The 6004 Joker self-setting wrench disappointed us in a different way.
On paper it solves a real problem: the jaw adjusts to the fastener, locks on, and ratchets without backing off. No thumb wheel, no repositioning. In practice, it doesn't deliver where it counts.
Where it falls short
The situations where you actually need a ratcheting adjustable wrench are almost always the hard ones — tight spaces, awkward angles, fasteners you can't see. And in exactly those situations, the self-setting Joker starts playing jokes.
It slips off. The self-setting jaw doesn't grip like a real wrench. At an odd angle or under real torque, it lets go — not every time, but enough to lose your trust.
The ratcheting arc is too wide. In a tight space — exactly where you want a ratcheting wrench — the swing needed to re-engage the next tooth is often more room than you have. That defeats the entire purpose of the tool.
It's harder than finding the right wrench. After wrestling with it in a few difficult spots, we kept putting it down and digging out a standard combination wrench or a crow's foot. Faster, more reliable, less frustration.
Where it works fine
On easy-access fasteners with room to swing, it's a nice tool. Build quality is classic Wera — solid, good finish, comfortable. The holding function that keeps it on the nut when you pull away is genuinely clever. Light assembly, furniture, accessible automotive work: you'd probably like it.
The bottom line
- We love Wera tools generally
- Self-setting concept is genuinely clever
- Classic Wera build quality
- Slips in tight spaces
- Ratcheting arc is too wide
- More trouble than a standard wrench when it matters
A great idea that doesn't survive contact with the situations where you actually need it. In easy spots it's a nice wrench; in hard spots it slips, can't complete its arc, and costs you more time than a traditional wrench. It's been relegated to novelty status in our toolbox. We wanted to love it. We can't recommend it.
Check the options
We do not recommend the self-setting Joker for tight-space work, but the current price and conventional alternatives are here for comparison.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases.
A conventional alternative we actually use
For engine maintenance aboard, our NEIKO 03575A metric combination wrenches have held up well, including to corrosion. These are conventional open-end/12-point box-end wrenches, not self-adjusting or ratcheting substitutes for every Joker function.
