Hand drill bit specifications, impact drill bit specifications, how many?
If the chuck can only clamp less than 6, more than 6 of the drill can not be used. If the chuck is larger than 13, of course, there are many mm13 specifications below. Percussion drill bit is fixed, no fractional / I saw and used: 6, 8, 10, 12, 14, 16, 18, 20, 25, 32. Bigger than 32, we should use the open hole machine.
There are many specifications for hand drill and twist drill. There are integers and decimals. For example, 2.5, 3.5, 4.2, 4.5, 4.7, 5.2, 5.5, etc., they should be determined according to your requirement and the size of the drill chuck.
