4.7(2,599)Amazon rating$7.60100+ bought last month
Our verdict
The Capri 30037 is one of the most-reviewed single triple square keys available, earning 4.7 stars from 2,599 owners at just $7.60 per piece. It is the smart buy when you need one specific XZN size without paying for a full set.
Mechanics and DIYers who know exactly which XZN size they need and want a well-proven individual key at a very low cost.
Skip if
You need multiple XZN sizes in one purchase, or you are tackling a first-time repair and are unsure which size fastener you will encounter.
Length 5.51 Inches
Weight 1.6 ounces
Pieces 1
Priced 45% below the category median ($13.85 across 10 tracked models)
Our scorecard
4.7/5overall
Owner rating4.7/5
4.7 average across 2,599 owner ratings
Popularity4.0/5
2,599 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other hand tools and workshop hand tools we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
At $7.60, the Capri 30037 stands out as a single-piece triple square key that has accumulated 2,599 verified reviews and a 4.7-star rating. That volume of owner feedback is unusually high for this niche category and reflects strong, sustained buyer confidence. Roughly 100 units sell per month, confirming active demand. The key measures 5.51 inches in length and weighs 1.6 ounces, giving it a well-proportioned feel for applying torque to XZN fasteners without the bulk of a full set.
For owners who already own most of a set and need to replace or add one specific size, the Capri 30037 is the logical choice. The price makes it practical to purchase two or three individual sizes for less than the cost of entry-level kits.
Owners consistently note accurate fitment on European vehicle XZN bolts. At 1.6 ounces the key is light enough to carry in a vest pocket but substantial enough to handle the torque demands of transmission and driveline work.
Pros
2,599 verified reviews with a 4.7-star rating, one of the highest review counts in this category
Very low per-piece price of $7.60 makes targeted single-size purchases practical
5.51-inch length and 1.6-ounce weight offer good leverage and handling
Consistent monthly sales of roughly 100 units confirm ongoing availability
Cons
Single piece only, so it requires knowing the exact XZN size needed before ordering
No set means multiple separate purchases if you need several sizes
Specifications
Length
5.51 Inches
Weight
1.6 ounces
Pieces
1
Performance notes
The Capri 30037 is a 5.51-inch, 1.6-ounce single XZN key. Its length provides adequate leverage for most transmission and suspension fasteners where triple square profiles appear. The compact single-piece format is well suited to targeted repair work rather than broad tool inventory builds.
What buyers say
Owners overwhelmingly praise the fitment accuracy and the low price point. The most common positive note is that the key seats fully without slipping on XZN fasteners. The primary complaint is that buyers sometimes order the wrong individual size and need to reorder, which is a selection issue rather than a quality issue.
The Capri 30037 is sold as individual sizes. Check your fastener with a known-size reference or consult your vehicle's service manual to identify the correct XZN profile before purchasing.
Is the Capri 30037 long enough for deep-set fasteners?
At 5.51 inches the key is suitable for most accessible XZN locations. For deeply recessed fasteners, owners sometimes use a hex-bit adapter in a ratchet instead.
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