Genuine OEM Volkswagen Hex Collared Bolt, part number N91051201. This bolt is designed to provide a secure, vibration-resistant fastening for the engine balance shaft module. The integrated collar design ensures even distribution of clamping force across the mounting surface. It is manufactured from high-strength steel to meet strict factory specifications for durability. Genuine OEM fasteners are critical for maintaining the precise alignment and structural integrity of internal engine modules.