Slotted Style Hard Hat Adapter Color Black Compatible with Brand Optrel Compatible with Grainger Part Number 35T252 35T253 35T255 Compatible with Manufacturer Model Number 1004.037-1 1006.4 1007.000 1007.070 K6500 K6501 K6700 K6701 K6801 K6802 K6803 K6804 K6805 K6807 Compatible with Series All Y Series Sphere Series Helmets Features Sphere Series Y Series For Use With Crystal2.0 e650 e670 e680 e684 p530 p550 Vegaview