Ultra Pro Necron Codex Aligned Alcove Flip for Warhammer 40k - UP16565 Steel Differential Bevel Gear so you're fitting the correct

so you're fitting the correct pitch and diameter for that model rather than guessing at a generic alternative

Genuine HPI Racing part — style code HPI160090 ensures correct fitment for supported models

Detailed instruction manual

and this factory part restores that function when the original has cracked or broken under impact

13mm diameter matches Losi shocks that accept 13mm springs

Ultra Pro Necron Codex Aligned Alcove Flip for Warhammer 40k - UP16565 Steel Differential Bevel Gear so you're fitting the correctThe Ultra Pro Necron Codex Aligned Alcove Flip for Warhammer 40k (UP16565) is a rulebook publication that gives you the rules, lore and army lists for your games. Key Features Ultra Pro rulebook A great pick for tabletop gamers and collectors