Notes: 11388390 SELF-LOCKING SCREW M10X30 12.9 ACCIAIO C is original CLAAS product. 11388390 SELF-LOCKING SCREW M10X30 12.9 ACCIAIO C1 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849