The 902-391 from Eclipse Tools is a high-quality 4 pc Robertson style insert bit set, designed for durability and precision. Each bit measures 1-15/16″ and includes sizes S1, S2, S3, and S4, making it perfect for a variety of applications. Crafted from premium materials, this set ensures reliable performance and longevity, making it an essential addition to any toolbox.
Eclipse Tools 902-391 Features
- Material: Made from S-2 tool steel with a hardness of HRC 59° ~ 61° for exceptional durability and resistance to wear.
- Versatile Sizes: Includes four different sizes (S1, S2, S3, S4) to accommodate a wide range of screws and applications.
- Precision Fit: Designed for a secure fit in screws, reducing the risk of stripping and improving torque transfer.
- Easy Identification: Clear markings on each bit allow for quick size identification and easy organization.
Eclipse Tools 902-391 Detailed Specifications
| Product Type | Robertson Style Insert Bit Set |
| Sizes Included | S1, S2, S3, S4 |
| Length | 1-15/16″ |
| Material | S-2 Tool Steel |
| Hardness | HRC 59° ~ 61° |



















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