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: A:US (51 pcs):60 x60mm/2.36 x2.36inch Measuring rang: 0.25 - 6.00mm/0.0098inch - 0.23inch Specification:A:51 pcs 60US.system: 4,4.5,5,5.5,6,7,8,9,10,11,11.5,12,13,14,15,16,18,20,22,24,26,27,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84 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.