Medium Interlocking Sign Channel - Sign Joining Rail A great solution for creating a butt joint between post mounted sign panels. Used extensively in the road sign sector the medium interlocking channel is suitable for permanent sign installations. Bond the sign channel to your aluminium or ACM panel with rivets or Structural Bonding Tape and then fix to sign post using post clips or screw banding. Available in lengths up to 3 metres (6m lengths available by phone) Suitable for permanent road signs Can be fixed with rivets or double sided tape Powder coated grey as standard