What is this for? On roof truss

[WWilts]

Roff trusses. Not clear to me whether the metal panels shown in pic are meant to have nails inserted, and if so how many. I mean the panels with loads of small arrow-like openings.

Edited January 22, 2022 by WWilts

[Thorfun]

I have those on my roof trusses and, afaik, they hold the joined timbers together. they have lots of spikes on the back and when two pieces of wood are put next to each other they bang one of those in and it holds them together.

 

or summink like that.

 

so, no nails required in those

Edited January 22, 2022 by Thorfun

[Thorfun]

but those joist hangers need nails. ?

 

[Thorfun]

11 minutes ago, Thorfun said:

I have those on my roof trusses and, afaik, they hold the joined timbers together. they have lots of spikes on the back and when two pieces of wood are put next to each other they bang one of those in and it holds them together.

 

or summink like that.

 

so, no nails required in those

something like this I believe

 

https://www.toolstation.com/tooth-plate-connector/p44246?store=SE&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&mkwid=_dc&pcrid=558033462390&pkw=&pmt=&gclid=EAIaIQobChMI08z1wKjF9QIVc4BQBh2JzAMnEAQYAiABEgK1n_D_BwE&gclsrc=aw.ds

[Russell griffiths]

Try getting one off. 

[Declan52]

The panels with small arrow like openings are used to join pieces of timber together. They are punched through so the missing bits act like nails and hold it all nice and tight. If your really bored and don't like your wrists try and batter one of. You will get tired, sore and bored very quick.