Bearing steel material: the steel gauge is made of bearing steel material, which is wear-resistant, sturdy and durable, with long service life. Fine processing: steel gauges are well processed and quenched at temperature for and strength. Different sizes: each needle gauge is labeled with the corresponding size, easy to identify, to meet your different needs Multi-functional application: steel gauges are suitable for checking position, hole size, gauge slots, hole spacing, pinning and non-pinning, setting other gauges and calibrating micrometers. Wide application: steel gauges are widely used in electronic boards, circuit boards, molds, fine machinery manufacturing and other high-tech fields