mechanics-dat/mechanical-tools-dat/mechanical-tools-dat.md
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![](2025-04-10-18-42-26.png)
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+## 🔧 Hex Bolt Screwdriver Size Categorization
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+### 1. By Tip Size (Across Flats)
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+The most important measurement is the **distance across the flat sides of the hex tip**.
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+#### 🧮 Metric Sizes (in millimeters)
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+1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, etc.
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+#### 📏 Imperial Sizes (SAE, in inches)
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+1/16", 5/64", 3/32", 1/8", 5/32", 3/16", 1/4", etc.
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+> 🔹 These sizes must match the hex socket of the bolt exactly.
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## ref
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