High -precision drilling measurement tool: This 6 -piece telescopic measuring instrument is designed for precise drilling measurement. It is made of High-quality materials, which has high precision and durability and can be used for a long time. The range of measurement is wide: the range of telescopic pressure meter is 5/16 inches to 6 inches (8 mm to 150 mm), so that you can easily measure pores. From small to large, this suit can help you . Thin design characteristics: Our holes are equipped with a rolling flower lock knob and a fixed area to provide safe grasping and easy adjustment. Precision measurement: This set of professional -grade telescopic pores can measure high accuracy from 1/8 inches to 1/2 inch holes, and grooves. Widely used: suitable for measuring small holes, , and grooves of industries, which are made of high -quality stainless steel. Material: Stainless steel colour: Silver Package Contents: 1 x Bore Gauge Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.