Long-term use - Made of manganese steel with heat treatment, it has the advantage of not rusting, long service life.Adjustment - Soft and sensitive adjustment for better feel, giving more accurate measurementsWide use - Four small hole gauges are suitable for measuring the deep and shallow holes, slots, etc.1. Small hole adjustable measuring gauge, vacuum quenching and titanium plating treatment prolong the service life of the product and make the outer surface brighter2. Easy to manage with different openings, precise non-slip tail, adjustable opening, do what you want and work more efficiently.Delivery Quantity: 1set (5pcs) (including 4 inner diameter gauges and a storage bag)Package Contents: Only the above package contents, excluding other products.Size: Details as shown(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Color: as pictured(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)