Weigh the cost of building versus the return on your investment in the balance and you may find a granny flat can offer a great return for years to come and can add value to your home should you decide to sell. *Cost and prices in this article are indicative and should only be used as a guide.
The needles are generally made of a heat-treatable stainless steel or carbon steel. To prevent corrosion, many are nickel plated. Depending on the style of device used, the main body of the tube can be made of plastic, glass, or both.
Staples are made of either mild steel alloys or aluminium or brass or zinc alloys... Staples are made out of metal or zinc plated steel. They have also been known to be made out of stainless steel (to provide rust proofing). The thickness of the staple depends on its use, be it stapling papers together or being used in construction. Staples are made by mending large pieces of metal together and then being bent into the shape of a staple. Imagine a long piece of thin metal in the shape of an upside down U (the staple shape). A sharp cutter then slices the staple into its appropriate size by moving down the metal (like corn on the cob).