PORTABLE EASILY: Small size and easy to carry, you can simply keep it in your bag,it is a good helper for designers, engineers, and mechanics. EASY TO USE: The feeler gauge that the material is stainless steel, With a hanging hole, easty to save,Has a laser etched size for easy identification. SCOPE OF APPLICATION: The ruler has high precision, widely used for measuring gap size and slot size. Feeler gauge set used for measure the thickness of tappet clearances, piston ring gaps ,spark plugs gaps, bearing clearances and other hard to reach places. PRODUCT CHARACTERISTICS: There has simple structure, fine workmanship, convenient to use,Each blade has sizes laser etched for easy identification. MAKING MATERIAL: This gauge is made of high quality stainless steel, and rust-resistant,with a lubricating oil coating, which can prevent pitting and corrosion, and is, Weight: 0.0220462262 Pounds, Manufacturer: Hyuduo