Features: Easy to use: You only need to stick/ screw/ nail the base of the insulating nail to the ceiling or wall, and pierce the glass fiber panel into the dowel. In order to ensure stability, there must be at least 1 dowel in each corner, and then push the washer to the pins to fix the panel in place. The whole process only take a few minutes to well stabilize the item. Practical tool: The package includes insulating nails and self locking washers, which can match various fixing materials well, and meet your various needs. Specifications: Material: Insulation nails: low carbon steel Self locking washers: mild steel Color: as pictures shown Size: as pictures shown Package includes: 100 x Perforated insulation pins 100 x Self locking washers Notes: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen display. The products may have a smell. After receiving, leave it to ventilate for 24 to 48 hours to remove the smell.