The outer shell is made from various leather types

Longlife Protection Guard

1-1/4" Engine Guards or Tubing

Horn with Standard Bracket

koso m18 weld in o2 oxygen sensor bung plug set BS90 The outer shell is madeKoso M18 Weld In O2 Oxygen Sensor Bung & Plug Set The Koso weld in oxygen sensor bung is used in for custom exhaust applications. Designed to accommodate 18mm oxygen sensors, this durable plain steel bung ensures a secure and reliable fit for your O2 sensor needs. Comes with plug and washer fitting the sensor bung for when it is not in use. Features: Made from plain steel Easy to weld M18x1. 5 thread size Sold in set with bung, plug and washer