Features: Sufficient quantity Each set contains 6 pieces of internal gauges of different sizes, with measuring range of 8-150mm, enough quantity for various of repair and DIY works. Multi function Designed to measure the inner diameter of a round and cylinder item, widely used on various woodworking, repair, DIT, etc. Easy to use Simply plug in the item and lock the telescopic spring, the rotary switch on the bottom is designed for adjustment, clockwise for tightening and anticlockwise for…