... /8" x 3/8"10.6mm x 10.6mm19,20,21,221/2" x 1/2"12.7mm x 12.7mm16 ... ,17,18,19,20,21,22,235/8" x 5/8"16mm x 16mm18,19 ... ,20,21,3/4" x 3/4"19.1mm x 19.1mm16 ... in rolls. Custom packing available at request. building construction material(manufacturer)