Sparkplug. The model is 8 Centimeters.
(max , blend , fbx , obj and stl file included)

Native File Format: 3ds Max 2012 Render Engine: V-Ray Model is Built to: Real-World Scale Polygon: Lowpoly and Subdivided Units used: Centimeters Polygon Count: 8468 Vertices Count: 9017

TEXTURE

DCC (Production) and PBR (Real Time Engines) 4096x4096 PNG format textures:

diffuse
Specular
Glossiness
Normal
base color
metallic
Roughness
ambient occlusion