T/S sight set Ghostring/S with Dot white

Caliber 12GA, repeating or hunting shotguns, T/S-Tactical Super sight SG3 locking ring ghost ring small 2mm black height and side adjustable and sight bead dot white interchangeable, sight bead for standard barrels with an outer diameter of .819/20.8mm to .882/21.4mm and also for thicker barrels with an outer diameter of .858/21.8mm to .882/22.4mm, including mounting screws and material, code SHT05R LPA Italy. Reworking is required for the rear sight - professional installation is recommended!