Easy to use: The user can fold the blades easily for simple and intuitive use. The choice of the desired size is made quickly thanks to the metric units engraved on each blade, clearly visible for optimal time saving. Wide range of sizes: The metric feeler gauge 804 offers 19 blade sizes from 0.04 mm to 1.00 mm to adapt to various professional applications. Measurement accuracy: The blades are precision-machined to specific thickness levels to accurately measure gap widths between two mechanical parts, ideal for checking spark plug gaps, piston ring gaps, bearing clearances, engine clearances, and more. Robustness and durability: Features a durable construction with solid metal blades and a nickel-plated frame, providing increased resistance to shocks, wear, and harsh working conditions, ensuring a longer service life. Reliability: The metric feeler gauge 804 is available in a calibrated version to ensure high measurement accuracy and reliable performance for mechanical maintenance and safety. Three versions available: The 804 model features round tips with a standard length of 90 mm, the 804.L with extra-long round tips of 150 mm, and the 804.9 with pointed tips of 90 mm, designed to meet a variety of application needs.