Welcome to our store! Easy to adjust: Suitable for precise measurement.Professional precision inside diameter measuring tool! Easy to use: the handles are rigidly attached to the contact pistons and are automatically self-centering, to obtain a perfect fit with the hole. Check holes accurately: Rigid double-action handle with self-centering feature allows quick checking of holes, slots and recesses up to 6 deep. Advanced design concept: the ends of both contacts are made of head treated stainless steel and precision ground to a radius to allow adequate clearance on the smallest hole the gauge will enter. 6pcs gauge set: 5/16 - 6 (8mm - 150mm): Gauges 8-12.7, 12.7-19, 19-32, 32-54, 54-90 and 90-150mm.You can measure different hole sizes with this inside diameter measuring tool. Scope of delivery: 6pcs/Set Product Color: Silver Product size: 8 - 150 mm Note: Manual measurement, please allow 1 - 3cm error!!! 100% Satisfaction - Our customers are our priority.If you find any problems with the products after receiving the goods, such as damage and incorrect quantity, please contact us immediately.We do our best to provide you with satisfactory after-sales service.