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Self-tapping screws are screws that can tap its own hole as it is driven into the material. Countersunk design allows a screw to be �sunk� into a piece of lumber. Pozidriv head design ensures screwdriver head does not cam-out. Black Japan is a lacquer or varnish suitable for many substrates but known especially for its use on iron and steel. Its high bitumen content provides a protective finish that is durable and dries quickly.
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| Product properties | |
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| Brand | Fastbolt |
| Category | Countersunk |
| Outside Diameter (mm) | 3.5 |
| Length (mm) | 19.0 |
| Grade | 4.8 |
| Material | Mild steel |
| Series | Metric |
| Type | Countersunk |
| Surface Finish | Black Japan |
| Screw Drive | Pozi |
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