Hettich Plastic Glass Shelf Support Pin is made from solid plastic material This glass shelf support pin won’t rust or corrode in any condition This shelf support pin can fit 5 mm and 6 mm shelf holes The shelf support pin has unique design keeps the pin firmly seated in the cabinet holes, eliminating the chance of tear-out Use this shelf support pin for cabinet, bookshelf, display cabinet, furniture, wardrobe, closet, cupboard, bookcase, pantry shelving