Stainless Steel Slotted Groove Pipe for Handrail

Does anyone know how to create a pipe that has a u-shaped slot in it? I attached my best attempt at it I need the slot to be perpendicular

Manufacturer of Stainless Steel Slot Pipe offered by MS Dolphins Steel Art, Mumbai, Maharashtra

slot 42 Square Slotted Pipe · Size: 40 x 40, 50 x 50 · Unit Pipe Length: 6 meter · UsageApplication: Glass Railing · Steel Grade: Stainless Steel 304 Grade · Material:

slot 5 lion Stainless Steel Gold Coated Slotted Pipe · Thickness: · Brand: Kiwinox · Shape: Square · Unit Pipe Length: 6 meter · Suitable for Glass: Yes · Size: 3