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Advantages
1.You can communicate quickly with anyone on the Internet. Email usually reaches its destination in a matter of minutes or seconds.
2.You can send letters, notes, files, data, or reports all using the same techniques. Once you learn how to use your email program, everything is sent the same way.
3.You don't have to worry about interrupting someone when you send email. The email is sent and delivered by one computer system communicating with the Internet. Although it is put into someone's mailbox, the recipient isn't interrupted by the arrival of email.
4.You can deal with your email at a convenient time. You don't have to be interrupted when email arrives, and you can read it or work with it when you have the time. Also, you can send it at a convenient time. It doesn't have to be written or sent at a time when you know the recipient will be available. This is what we mean by the term asynchronous communication.
5.You don't have to be shy about using email to communicate with anyone. Email isn't anonymous-each message carries the return address of the sender-but you can write to anyone with an Internet address. All the messages appear the same to the person who gets the email. The messages are generally judged on what's in them, not where they're from.
6.The cost to you for email has nothing to do with distance, and in many cases, the cost doesn't depend on the size of the message. Most Internet access charges are based on the number of hours per month you access the Internet, or you pay a flat monthly fee.
Limitations
1.Email isn't necessarily private. Since messages are passed from one system to another, and sometimes through several systems or networks, there are many opportunities for someone to intercept or read email. Many types of computer systems have protections built in to stop users from reading others' email, but it's still possible for a system administrator to read the email on a system or for someone to bypass the security of a computer system.
2.Some email systems can send or receive text files only. Even though you can send and receive images, programs, files produced by word processing programs, or multimedia messages, some folks may not be able to properly view your message.
3.It's possible to forge email. This is not common, but it is possible to forge the address of the sender. You may want to take steps to confirm the source of some email you receive.
4.It's difficult to express emotion using email. The recipient doesn't have the benefit of seeing your facial expressions or hearing your voice. You have to be careful with humor or sarcasm, since it's easy for someone to take your message the wrong way.
5.You can receive too much or unwanted email. You can receive "junk" email in the same way you receive other types of junk mail. On the Internet, junk mail is called spam. You may have to take active steps to delete the email you receive and try to stop it from being sent to you in the first place
6.You may not know about the person with whom you are communicating. The communication is often al in text and it's possible for us to get an incorrect impression of the person sending us email. Also, some people misrepresent themselves.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 24184EK30 NACHI | 420 | 700 | 280 |
| 23184EK NACHI | 420 | 700 | 224 |