Our company produced all kinds of cable tray, for example:
Cable ladder tray that include:

Through ladder bridge
Horizontal bend elbow for cable ladder
Horizontal bend elbow of right-angle for cable ladder
Horizontal ladder T-way
Horizontal ladder four-way
Vertical ladder concave elbow
Vertical ladder convex bend elbow
Vertical ladder rotation elbow
2. Cable plate tray that include:
Through plate bridge
Horizontal plate bend elbow
Horizontal plate T-way
Horizontal plate four-way
Vertical plate concave elbow
Vertical plate convex elbow
Vertical plate rotation bend elbow
3. Trough cable bridge that include
Slotted through bridge
Terminal head of slotted through bridge
Slotted horizontal bend elbow
Slotted horizontal T-way
Slotted up vertical T-way
Slotted down vertical T-way
Slotted upside vertical T-way
Slotted downside vertical T-way
Slotted superior horn vertical T-way
Slotted inferior horn vertical T-way
Slotted horizontal four-way
Slotted vertical up bend elbow
Slotted vertical down bend elbow
Slotted vertical left-down bend elbow
Slotted vertical left-up bend elbow
Slotted vertical right-down bend elbow
Slotted vertical right-up bend elbow
Slotted reducer connector