The entrance hole on bluebirds should be 1.5 inches.
One and one half inch for a nest hole entrance.
About 7 centimeters
An inch and a half is standard.
10cm
1 ½''
yes, but they are very specific about what they like and the size of the hole etc. you should Google bluebird houses and find the exact information. It also depends on the food source in the area as to whether they will use the house.
A trade size hole for a 2-1/2" EMT conduit connector, the hole needs to be 2-7/8" in diameter. A 3" rigid conduit can also use this size hole without the lock nuts falling into the hole.
There several eyelet setting kits on the market with complete instructions, some of the newer eyelet kits are not as effective as the older ones, the most common problem is the wrong size hole for the size eyelet, what ever size eyelet you use, use the proper size hole (most kits have hole dies for that size eyelet) and follow included instructions.
They give many bluebirds a place to live at the same time. The population can increase because of the amount of bluebirds that can nest in that area.a bluebird trail is a group of nesting boxes. this helps the bluebirds because then they have places to live and have babies.
Most metals are initially drilled with a narrower drill, forming a pilot hole. Then the right size drill is used to complete the drilling of the hole by widening the pilot hole.
The hole and shaft basis system are pre-defined tables / methods in which you use to find tolerances. If you have a set hole size and wish to find the shaft diameter and tolerance required you would use the hole basis system. If you had a shaft at a set size and needed to find the hole size and tolerance required for it you would use the shaft basis system. If you need any more info on it you could try and google it or look it up in something like the machinist handbook (probable google it aswell)
You use a 0.875 bit or a 7/8 bit . They are the same size.
Yes, it has. Size of ozone layer changes according to the use of CFC's.
Bluebird microphones can be purchased from any major electronic and PC retailer. Bluebirds are great for skype use and they can also be used on mobile devices that have the software that supports microphone use.
If you want the bolt to slide through the hole a 5/16 hole will work well.
If no drill bit this size available, can use EDM service if metal is used
Because you presumably want your hole to be the right size, not too small or too big.