Go to a hardware store and get the size bit you need that is made for metal. Most cast iron isn't really hard unless it is white cast iron. If the hole is over 3/16, pre-drill it with a small bit first. It might be a good idea to use some cutting oil to.
Other foods that are high in calcium include: 1  Spinach. 2  Kale. 3  Okra. Collards. 4  Soybeans. White beans.  Some fish, like sardines, salmon, perch, and rainbow 1  trout. Foods that are calcium-fortified, such as some orange juice, oatmeal, and breakfast  cereal.
Rating Newest Oldest. Best Answer: Calcium is the most abundant mineral in the human body and is necessary for a variety of functions, including muscle contraction, blood vessel function, the production of hormones and enzymes, and the transmission of impulses throughout the nervous system.airy Sources The highest amounts of calcium can be found in dairy foods. Plain, low-fat yogurt is the highest in calcium, with 415 mg per 8 oz. serving, followed by cheddar cheese with 306 mg in 1.5 oz.