Please make sure the pegs size you need for the-holes in your shelving / cabinets before purchase They are very, you need not use tools, just install or uninstall it by hand Wide Application: Especially for cabinet, bookshelfs, display cabinet, furniture, wardrobe, closet, cupboard, bookcase, shelving Warm Notice: In order to make shelf-pins a tight-fit, your hole should be equal to or slightly smaller than the diameter shown ( less than or equal to 5mm : Iron+, good and for long using life; Smooth surfaces without metal burr, comfortable and never hurt your hand, Manufacturer: Kelisdi