ARP 18 mm x 1.5" Thread Harmonic Balancer Bolt 2.750" Long 27 mm 12 Point Head Chromoly - Black Oxide RS004C1808 The sensor eliminates any chance

The sensor eliminates any chance of incorrect readings due to interference from debris

Diaphragm / Screws

Allows fine tuning pump/drive belt alignment

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ARP 18 mm x 1.5" Thread Harmonic Balancer Bolt 2.750" Long 27 mm 12 Point Head Chromoly - Black Oxide RS004C1808 The sensor eliminates any chanceARPs product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, IMSA, NASCAR and NHRA drag racing and marine applications. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Harmonic Balancer Bolt 18