Bolt Size Finder Keychain
Guessing socket sizes wastes time. This compact keychain tool instantly identifies both Metric and SAE bolt sizes, so you always grab the right socket the first time.
How it Works
The Bolt Size Finder keychain lets you instantly identify bolt and nut sizes in both Metric and SAE, saving time and eliminating guesswork.
Built for Real Work
Instant Bolt Size ID
Quickly identify any bolt or nut size without test fitting sockets.
Metric & SAE in One Tool
Measures Metric (8–25 mm) and SAE (5/16–1"), covering the most common ranges.
Compact & Portable Design
Small keychain format makes it easy to carry everywhere you go.
Saves Time and Effort
Eliminate wasted time trying sockets—know the exact size instantly.
The Challenge
Guessing Costs Time
Mechanics waste time test fitting sockets when bolt sizes aren’t clear, slowing down jobs and causing unnecessary frustration.
The Fix
Identify Instantly
Gauge bolts and nuts on the spot without trial and error.
One Tool, Two Systems
Works for both Metric and SAE sizes, so you’re always covered.
Always With You
Portable keychain design ensures the tool is always on hand.
The Specs
In the Field
Trusted by People in Leading Brands
Olsa Tools by the Numbers
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Hours Saved Annually by Professional Mechanics
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Customers Served
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Dealers Across Canada and the USA
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Years of Serving Customers (Since 2015)
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Average Customer Service Response Time During Business Hours