Here is a general progression of plate item bracers for a DPS Death Knight in Northrend for World of Warcraft.

The Vambraces of the Vengeance Bringer from the Utgarde Keep quest “A Score to Settle” will carry you from 68 to 77. It is highly recommended that you get that completed as early as possible. If this is skipped, your options are limited until you hit Icecrown, where several upgrades are available to you. Then, the crafted Vengeance Bindings at level 78 will carry you all the way to 80.

1. Level 68 Vambraces of the Vengeance Bringer (1068)
   Obtained by: Quest Reward – A Score to Settle (Utgarde Keep)
2. Level 68 Landlocked Wristguards (599)
   Obtained by: Quest Reward – Not Without a Fight! (Borean Tundra)
3. Level 68 Freed Shackles (726)
   Obtained by: Quest Reward – Leading the Ancestors Home (Borean Tundra)
4. Level 69 Shaleground Bracers (775)
   Obtained by: Quest Reward – The Conqueror of Skorn! (Howling Fjord)
5. Level 73 Wyrmbane Wristguards (988)
   Obtained by: Quest Reward – Canyon Chase (Dragonblight)
6. Level 75 Spiked Cobalt Bracers (1062)
   Obtained by: BoE (Blacksmith or 16 gold)
7. Level 77 Hardened Bone Wrist Protectors (1065)
   Obtained by: Quest Reward – Killing Two Scourge With One Skeleton (Icecrown)
8. Level 77 Jotunheim Shackles (1103)
   Obtained by: Quest Reward – The Art of Being a Water Terror (Icecrown)
9. Level 77 Plated Bracelet of the Skies (1205)
   Obtained by: Quest Reward – Volatility (Icecrown)
10. Level 77 Battlescar Spirebands (1215)
    Obtained by: Quest Reward – Not-So-Honorable Combat (Icecrown)
11. Level 77 Rings of Nergeld (1266)
    Obtained by: Quest Reward – The Sum is Greater than the Parts (Icecrown)
12. Level 78 Vengeance Bindings (1657)
    Obtained by: BoE (Blacksmith or 125 gold)

Prices and links provided by Wowhead. Gear score provided by Loot Rank (based on the PvE Death Knight template).