Two piece universal M18x1.5 oxygen O2 sensor spacer adapters. This extension spacer set fits O2 sensors with M18x1.5 threads and provides needed clearance in tight exhaust layouts. What you get - Quantity: 2 spacers - Thread: internal and external M18 x 1.5 pitch - Universal fit for M18x1.5 sensors - Extension spacer for adjusting sensor position Key benefits - Improves sensor spacing and clearance around aftermarket components such as filters, mini catalysts, or tight exhaust layouts - Direct replacement style with easy installation - Reliable, simple solution to maintain proper sensor readings and reduce risk of false check engine codes Compatibility - Fits O2 sensors with M18x1.5 thread standard; suitable for many vehicle makes and models that use this thread pitch Use scenarios - Installing or upgrading an aftermarket exhaust or catalytic converter where sensor position is too close to heat sources or components - Relocating an O2 sensor in tight spaces to achieve proper clearance and avoid contact with nearby parts - Replacing or refurbishing sensors in vehicles that require slight spacing adjustments to maintain accurate readings Notes - Ensure your sensor and the spacer share the same M18x1.5 thread specification for a proper fit.