Applied to measure thread and external thread tooth pitch. The thread plug gage, through quenching processing, strong hardness, head with a magnetic. Using rotary switch can be freely adjusted. Easy to use, light and delicate, with precise measurements and simple design, which can be widely used and . It is useful for checking tool angle while cutting threads in metal turning lathes. Type: B:Metric+ imperial (52pcs): 67 x20mm/2.63 x 0.78inch Measuring rang: 0.25 - 6.00mm/0.0098inch - 0.23inch Specification:B:52pcs 60Metric/Imperial: 60Metric:0.25,0.3,0.35,0.4,0.45,0.5,0.6,0.7,0.75,0.8,0.9,1.0,1.25,1.5,1.75,2.0,2.5,3.0,3.5,4.0,4.5,5.0,5.5,6.0 55Imperial:4G,4-1/2G,5G,6G,7G,8G,9G,10G,11G,12G,13G,14G,16G,18G,19G,20G,22G,24G,25G,26G,28G,30G,32G,36G,40G,48G,60G,62G Color: Silver Material: stainless steel Package Contents: 1 x Thread Plug Gage Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.