Quality Assurance: Well-designed and well-crafted. Not an part number part, but meets part number manufacturing requirements. This is the manufacturer's replacement and is functionally equivalent to the original part. Premium Material: Made of premium material, not easy to break and can be used for a long time. Easy to install, just replace the damaged parts, no need to repurchase the entire product, saving time and money. Compatibility: N621119 Steel Outer Clamp Washer 648697-00 DCS372 Blade Bolt Compatible with DCS390 DCS391 DCS392 DC310 DCS373 Circular Saw DC310K DC390B DCS393. N621119 Steel Outer Clamp Washer 648697-00 DCS372 Blade Bolt Compatible with DCS390 DCS391 DCS392 DC310 DCS373 Circular Saw DC310K DC390B DCS393 Outer Clamp Washer Tool Replacement Part for, Weight: 0.07936641432 Pounds, Manufacturer: Kueohse