Haven't a Clue 2

[Houdini48]

Found on a private military beach, low volume, these rectangular items (2) appear to be copper.

 

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[crashbandicoot]

Piece of hand grenade shrapnel?

 

[TheCannonballGuy]

I see this is your 2nd-ever post at TreasureNet... so let me start by saying "Welcome to T-Net's What-Is-It? forum, the best place on the internet to get unknown objects CORRECTLY identified." (Never trust what Ebay sellers say, or even Worthpoint.)

The finds you asked about in this discussion-thread are definitely fragments of a 20th-Century artillery shell's copper sabot, also called the "driving band." (Sorry, there's no way to tell with certainty whether they are WW1-era, WW2-era, or later.) See the photo below.

The sabot fragments on that beach add weight to SmokeyTheCat's ID of the brass discs you found being part of a 20th-Century artillery shell's time-fuze.

 

[crashbandicoot]

Cannonballguy has it.I see the rifling grooves now!