[] Made from aluminum with black coating, offering durability, strength, lightweight construction, and resistance to deformation. [Functions] Designed to conveniently, quickly, and accurately measure valve spring installed height. Compatible with most V8 engines. [Easy & Convenient to Use] Install the height micrometer like a valve spring, then expand until it seats against the valve, lock, and retainer. [Precise Reading] Simulated installation enables highly accurate measurements. Read like a standard micrometer. Measuring range: 1.600 inch – 2.200 inch. Color: As shown Material: Aluminum Note: Due to variations in manufacturing batches, slight differences in appearance or color may occur. These do not affect functionality. Package Contents: 1 x Valve Spring Height Micrometer Note: Light reflection and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±0.04–0.12 inch.