Generals Feeler Gages are used for adjusting and gauging spark plugs, distributor points and valve clearances, or any other instance of measuring the space between two parts. Our best-selling Economy Series Gages provide spot-on accuracy at a competitive price. This 15 Leaf Economy Feeler Gage features straight leaves etched with both Metric and English units, ranging from .002 to .025 in. and .051mm to .635mm. The set is housed in a protective holder to preserve the trueness of the leaf edges. 15 Straight Leaves. Used to measure the space between two parts. Leaves are etched with both English and Metric units. Includes the following sizes: .002, .003, .004, .005, .006, .007, .008, .010, .011, .012, .013, .014, .015, .020 and .025 in. Metric range is .051mm to .635mm. Leaves are 3 in. long. Protective holder protects leaf edges when not in use.