We need to get slots cut for 22 slats. We will provide the parts, which are made of stainless 316. All you need to do is just cut the 258x10x4 mm slot in the middle (the round chamfer can be smaller if necessary). Though there could be concern about bending during cutting, trials we done shows it would not affect the manufacturing and function as long as the part is clamped properly on your cnc. No special requirements on tolerance. General machine finish and precision up to 0.5mm will be acceptable.