In a compact, sturdy plastic rewindable dispenser case|Rewind feature permits retracting thinner feeler stock into the case, preventing damage|Made of the finest tempered steel|Marked every 6" or 150 mm with a line, thickness in thousandths of an inch or in hundredths of a mm (exception No. 666-1/2/cat.no. 52797)|Case provides the ability to snip off the desired length without any waste