1)material:

hot dip galvanized steel.

2)Application: 

 link fitting are used to link clamps to insulator,and ground wire clamps to tower arms or subjection structures.

 The common type is usually pin connected type. also used in the connection between suspension clamp and dead end clamp ,the connection  betwen stay wire and perch .

 They have different grades according to the load and are exchangeable for the same grade.