Hellermanntyton edge protection grommets hv1 series hellermann tyton 633 02120 the hellermanntyton 633 02120 hv1212 is a edge protection grommet made of cadmium free flexible pvc or polyethylene and resistant to various minerals and environmental effects the edge protection grommet is are used wherever cable and wires are routed through outlets and apertures hellermanntyton grommets offer excellent mechanical protection hellermanntyton 633 02120 hv1212 pvc bk n1 grommet black 70 x 10