How can I make a grip that is like the one on Count Dooku's lightsaber from Star Wars I am attempting to model Count Dooku's lightsaber from Star Wars. However, I can't figure out how to make that triangular grip on the middle portion of the lightsaber on my model as shown in the ref image below. The triangular black portions are especially giving me trouble as well as the bumpy texturing on the grips. I would appreciate some help in solving this problem!

Reference image


My model so far

Edit: I think I forgot to clarify. I actually have two problems. The first is actually getting the triangular shape of the grip onto my model. The second is the black texturing portion. You guys seem to have solved the texturing portion of it - thanks for that! But, I'm still having trouble with modeling the grip section. I've tried using knife project but the base corners of the triangle don't stretch out to the sides if I attempt to project from a top view!
The grip texture is quite easy to do.
It's just a brick texture with Bump/Displacement.




Use the Brick Texture node. Set Width and Height the same, to get that square pattern.
Connect it to the UV map and rotate it 45° using the Mapping node
Add Color ramp to control the height difference, and use it with Bump or Displacement node


You can use it with the Bump node, to fake the 3D appearance.



Or use the Displacement node, for a real 3D effect. It requires a lot of geometry. Also, don't forget to enable true displacement in the material settings.