Hellermanntyton edge protection grommets hv1 series hellermann tyton 633 02180 the hellermanntyton 633 02180 hv1218 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 02180 hv1218 pvc bk m1 grommet black 9 x 4