The Sunex 993505M is a compact, task-specific 21mm box-end wrench that delivers reliable torque on a tight budget, backed by a 4.6-star rating from 105 verified owners.
Mechanics or DIYers who regularly need a dedicated 21mm reach without carrying a full set.
Skip if
You need metric coverage beyond 21mm or want a combination style wrench with an open-end jaw on the opposite side.
Length 9 Inches
Weight 0.03 Pounds
Capacity 21 Millimeters
Priced 48% below the category median ($25.59 across 35 tracked models)
Our scorecard
4.4/5overall
Owner rating4.6/5
4.6 average across 105 owner ratings
Popularity1.7/5
105 owner reviews, fewer 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
The Sunex 993505M is a single-size, 21mm box-end wrench measuring 9 inches in length and weighing just 0.03 pounds. That featherweight build means it slides into a tool bag or pocket without adding bulk, making it a practical grab-and-go piece for wheel-bearing work, brake hardware, or suspension bolts sized at 21mm.
At $13.34 it is priced as a purpose-built single wrench rather than part of a set, which suits shops that already own a comprehensive kit but need an extra 21mm reach. Based on specs and verified owner reviews, 105 buyers rate it 4.6 stars, suggesting solid build quality for the price point.
The published specs list length and capacity but do not confirm material or finish, so buyers who need those details should verify on the full product listing before purchasing.
Pros
21mm box-end matches common wheel-bolt and suspension fastener sizes
9-inch length provides useful leverage without being bulky
Extremely light at 0.03 pounds for easy one-hand use
4.6-star rating from 105 verified owners
Under $14 price is budget-friendly for a single-size specialty wrench
Cons
Single size only, no open-end jaw for faster bolt starting
Material and finish are not published in the listing specs
No recent monthly sales data to gauge current demand
Specifications
Length
9 Inches
Weight
0.03 Pounds
Capacity
21 Millimeters
Performance notes
The 21mm capacity covers a size commonly needed for lug nuts and suspension hardware. At 9 inches long the wrench offers enough leverage for moderate torque tasks. The 0.03-pound weight keeps hand fatigue low in overhead or confined-space applications.
What buyers say
Owners tend to highlight the accurate fit on 21mm fasteners and solid feel for the price. The main complaint category is limited to it being a single-size tool, which some buyers did not anticipate from the listing.
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