Tempered Steel Thickness Gage, .002"-.015" Range, 11 Leaves. The Starrett 245 Thickness Gage consists of a wire gauge, an Engineers' combination taper gage for measuring slot widths, and an assorrtment of thickness gage leaves, all folding within a compact steel case. This product includes a locking device to lock any leaf or leaves in position. Includes a taper gage leaf for measuring slot widths from 1/64-3/16" in 64ths of an inch.