Please follow the following steps

• Open the new part

• Select the front plane.

• Sketch a polygon.

• Parameter : 5 and circle R20. OR it is your choice to set it.

• Extrude your sketch and set the depth 250mm.

• Select your object and apply flex command
• insert----> Factures---->Flex...

• Select bending
• Angle : 90deg.
• Plane 1 trimming distance : 70mm.
• Plane 2 trimming distance : 160mm
• Then click ok

• Edit Appearance.

• Select color.

• Choose your favorite color then click on ok.

• Your L key is ready.

L Key project in solid work using flex command