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There are five commonly used types of letter of credit. Each has different features and some are more secure than others. The most common types are:
1. irrevocable
2. revocable
3.unconfirmed
4.confirmed
5.transferable
Other types include:
1. standby
2.revolving
3.back-to-back
Sometimes a letter of credit may combine two types, such as 'confirmed' and 'irrevocable'.
Irrevocable and revocable letters of credit
A revocable letter of credit can be changed or cancelled by the bank that issued it at any time and for any reason.
An irrevocable letter of credit cannot be changed or cancelled unless everyone involved agrees. Irrevocable letters of credit provide more security than revocable ones.
Confirmed and unconfirmed letters of credit
When a buyer arranges a letter of credit they usually do so with their own bank, known as the issuing bank. The seller will usually want a bank in their country to check that the letter of credit is valid.
For extra security, the seller may require the letter of credit to be 'confirmed' by the bank that checks it. By confirming the letter of credit, the second bank agrees to guarantee payment even if the issuing bank fails to make it. So a confirmed letter of credit provides more security than an unconfirmed one.
Transferable letters of credit
A transferable letter of credit can be passed from one 'beneficiary' (person receiving payment) to others. They're commonly used when intermediaries are involved in a transaction.
Standby letters of credit
A standby letter of credit is an assurance from a bank that a buyer is able to pay a seller. The seller doesn't expect to have to draw on the letter of credit to get paid.
Revolving letters of credit
A single revolving letter of credit can cover several transactions between the same buyer and seller.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 23219EK NACHI | 95 | 170 | 55.6 |
| 22219AEXK NACHI | 95 | 170 | 43 |