Attachment types:

Standard type：

A type:

The single side has a wing.According to the number of bolt holes, they are called A1, A2, A3.

K type:

Both sides have a wing. According to the number of bolt holes, they are calledK1, K2, K3.

GA type:

The single sidebar has bolt holes. According to the number of bolt holes, they are calledGA2, GA4.

D type:

Extended pins. According to the number of extended pins, they are called D1, D2, D3.

Also, there are some special attachments like SA, SK, AS2, etc. How you choose the attachment depends on the working condition and your actual needs.