The spanner, code 1.49001-0529 1.A, is a specialized tool designed for use with the MAN L21/31 engine, ensuring precise tightening and loosening of critical fasteners. Engine maintenance requires tools built to exact specifications, and this spanner provides the durability and accuracy needed for servicing components under high mechanical stress. Using the correct spanner helps maintain proper torque levels, prevents damage to parts, and supports safe and efficient engine operation