This Siegen Feeler Gauge features 12 blades, dual marked in Imperial and Metric measurements. The offset tips are essential for checking tolerances on OHC configurations and are suitable for applications where straight blades cannot fit. The blades range in size from 0.008" to 0.026" (0.203 to 0.660mm) and have dimensions of 95 x 13mm with a 45?-25mm offset. It comes with a lifetime guarantee.