Openings on the radio for complete items (6)

'complete items' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'openings on the radio for' is the wordplay.
'openings' becomes 'holes' (hole is a kind of opening).
'on' means one lot of letters go next to another.
'the radio for' becomes 'w' (I can't explain this - if you can you should give a lot more credence to this answer).
'holes' put after 'w' is 'WHOLES'.

Can you help me to learn more?