If you are into wood, metal or masonry work then you must use hand drills for grinding holes in material. The Drill Bits of your hand drill need to be sharpened from time to time. For which you need to use a grinding machine. Also drill bits can be expensive so sharpening them rather than replacing them is a more rational thing to do. You can get your drill bits sharpened from a hardware store which may take a while. This could lead to prolonged machine downtime and you being unable to get your work done on time. But if you own it then you need to maintain it to ensure it lasts for a long time. Maintaining the hand drill itself does not take much. Taking regular care and carrying out some simple general maintenance work can do the job. Like making sure you clean it before putting it away and after you are done using it. You must keep it clean by using a soft brush to brush off wooden or metal scrapes off it and cleaning it with a soft cloth afterwards. You should oil it with a multi-purpose oil that lubricates it and protects it from rusting.