| Color: | Silver |
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| Folded: | Unfolded |
| Certification: | RoHS, GS |
| Samples: |
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| Customization: |
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| Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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| Payment Method: |
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| Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Suppliers with verified business licenses
Audited Supplier
| Groove | Hex Socket |
| Socket Size | 1/4 inch |
| Diameter | 7mm |
| Length | 50, 60, 75, 100, 150mm |
| Material | Aluminum, Stainless Steel, CRV, S2 |
| Surface Treatment | Blackening oxide/Chrome plating/Manganese phosphate/Sandblast |
| Packaging | Plastic bags, Blister, Sandwich, Tags |
| Customization | Acceptable |
| Brand | Union |
| Standard | DIN, ASME, JIS |
| Origin | China |
Bit extension bars are a must-have accessory for any toolkit. These simple tools allow you to extend the reach of your drill so you can drill holes in hard-to-access areas.
Bit extension bars are metal rods that attach between your drill chuck and drill bit. They come in varying lengths, usually between 3 inches and 18 inches long. The most common sizes are 6 inches, 12 inches, and 18 inches.
Extension bars are made from durable chrome vanadium steel or carbon steel. They have a male hex shank on one end that fits into your drill chuck, and a female hex socket on the other end to fit your drill bit. Some extension bars have male and female hex ends so you can connect multiple bars together for even longer reach.
When using a bit extension bar, it's important to apply firm pressure and drill straight. The longer the extension, the more chance it has of bending or whipping around if you apply force at an angle. Start drilling slowly and adjust your pressure as needed.
Extension bars are useful for drilling holes in ceilings, floors, decks, cabinets, and any other hard-to-access area. They allow you to avoid using a ladder to get your drill into tight spaces. Many auto mechanics use extension bars to reach engine parts without removing the entire engine.
| Main Fastener Coating | |||
| Types | Application | Spray Test Hours | Characteristics |
| Mirror Nickel-plating | ALL Metal | 72Hours | Stable Excellent polishing performance Improve Wear resistance Wide range of applications |
| Matt Nickel-plating | ALL Metal | 72Hours | |
| Black Nickel-plating | ALL Metal | 48Hours | High absorption rate of solar energy Used in solar collector panels. |
| Manganese Phosphate | ALL Metal | 72Hours | Enhanced resistance |
| Sand Blast | ALL Metal | - | Remove paint, rust, and residue scratches or casting marks |
| Electrophoresis | ALL Metal | 1000Hours | Maintain metallic luster Anti-corrosion properties |
| Color Electroplating | ALL Metal | 96Hours | Improve mental strength Prevent metal oxidation |
| Steel Material Chemical Composition | ||||||||
| Types | C | Si | V | Cr | Mn | Ni | Mo | Characteristic |
| CR-MO | 0.18-0.23 | 0.15-0.35 | - | 0.40-0.60 | 0.90-1.20 | - | 0.13-0.20 | 41xx-series SAE steel grades Excellent strength-to-weight ratio Stronger and harder Not easily welded |
| CRV | 0.5 | 0.3 | 0.18 | 0.80-1.10 | 0.70-0.90 | - | - | 6000-series SAE steel grades Suitable for hardening Resist abrasion, oxidation, and corrosion Improve material elasticity |
| S2 | 0.40-0.55 | 0.90-1.20 | <0.50 | - | 0.30-0.50 | <0.30 | 0.30-0.60 | One of seven types of shock-resisting steels under the AISI Classification High strength High toughness Wear resistance High hardness Resistance to shock loading |
| 45# | 0.42-0.05 | 0.17-0.37 | - | ≤0.25 | 0.50-0.80 | ≤0.25 | - | Compared with A3, it has higher strength and resistance to deformation. |
| A3 | 0.95-1.05 | 0.10-0.50 | 0.15-0.50 | 4.75-5.50 | 0.40-1.00 | - | 0.90-1.40 | High-quality high carbon alloy tool steel |
Suppliers with verified business licenses
Audited Supplier 
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