Tutorial: Request, Perforated tubing
its simple and easy. Just wrap and patterns.
Sketch on right plane, for tube's body.
extrude it to what ever the length of tube you want.
Sketch this on the top plane.
Select wrap feature.
Create a de boss wrap feature.
Make a circular pattern of the wrap feature.
Create this sketch on the top plane, must have straight lines parallel to axis of the tubing.
Surface extrude it, use any length you want. This just a helper surface for the linear pattern.
Make a linear pattern, in second direct, pattern seed only. Same distance in both directions, obviously.
Delete the surface body.
The finished part.