Starrett Taper Gauge .010-150in 0.3 - 4mm 0.05mm 270Taper Gage measures hole and slot sizes. It is quick to use, very accurate, and is a convenient size. Very useful tool for bearing work and for gaging slots Made of quality tool steel and accurately tapered throughout entire length for quick and convenient measuring 11mm (7 16") wide by 160mm (6 1 4") long Can be used as a precision shim One side graduated from . 010" to . 150" in thousandths of an inch; the reverse side from 0. 3mm to 4mm in one