Features: Made of stainless steel or carbon steel 4 way measurement (inside, outside, depth and step measuring) According with GB/T1214.2 standard Products can be provided at clients' requests Measuring range: 0-70mm, 0-100mm/4", 0-150mm/6", 0-200mm/8", 0-300mm/12", 0-500mm/20", 0-600mm/24", 0-800mm/32", 0-1, 000mm/40" Grade: 0. 05mm, 0.02mm, 0.05mm/1/128", 0.02mm/1/1000"