RS Pro PVC Grommets. A selection of 8 different sized standard grommets (type 1) and 2 different sized easy fit grommets (type 2). Suitable refills for PVC Black Grommet Kit, Stock no. 666-4584. Supplied in bags of 100. Outer Diameter Versions Available:. ; 666-4593 666-4593 - 8.5 mm ; 666-4596 666-4596 - 10.2 mm ; 666-4590 666-4590 - 13.3 mm ; 666-4600 666-4600 - 15.5mm ; 666-4603 666-4603 - 19.5 mm ; 666-4607 666-4607 - 23.7 mm ; 666-4613 666-4613 - 23.9 mm ; 666-4616 666-4616 - 29.9 mm ; 666-4622 666-4622 - 30 mm ; 666-4619 666-4619 - 38.1 mm