LEGO Part 32054 Technic, Pin 3L with Friction Ridges Lengthwise and Stop Bush [Black] (4140801, 4107742, 3205426) | iBricktoys: LEGO shop guide and database
Amazon.co.jp: Ryohin Warehin AAC Type PHANTOM Flashhider Steel 0.6 inch (14 mm) Reverse Screw Compatible : Hobbies