Unglued Self-Locking with Two Double Walls – Locking Flaps with Fold-Over Expansion Piece B20.02.00.50.a Unglued Self-Locking with Two Double Walls – Locking Flaps with Fold-Over Expansion Piece B20.02.00.50.a Production Team2021-05-18T21:54:32+08:00 ECMA B20.02.00.50.a Unglued Self-Locking with Two Double Walls - Locking Flaps with Fold-Over Expansion Piece