6434 Sleeve Height and Counter Bore Gauge Compatible with All Diesel Engines 6434 Cylinder Engines Bore Gauge Range 0-1.00″ Graduation 0.001″ Reading 0-100. 【Premium Materials】: Constructed from robust aluminum with high hardness, impact resistance, and excellent corrosion resistance The dial indicator features waterproof, dustproof, and vibration-proof design for exceptional durability.