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Description: 【Telescoping gage set include】:Range: 5/16" - 6" (8mm to 150mm),6 Pcs in total A - 8 To 12.7 mm 5/16 inch To 1/2 inch;B - 12.7 To 19 mm1/2 inch To 3/4 inch;C - 19 To 32 mm 3/4 inch To 1 1/4 inch ;D - 32 To 54 mm 1-1/4 inch To 2-1/8 inch;E - 54 To 90 mm 2-1/8 inch To 3-1/2 inch;F-90 To 150 mm 3-1/2 inchTo 6 inch;include 6 size ranges. 【【Constant Spring Tension】: The spring tension of telescopic bore gauge set gives uniform contact pressure, can detect the inner diameter in a hole . 【Unique Design】: Spring of telescopic gauge loads with knurled locking knob and knurled holding area.Used for measuring holes, slots, grooves, and recesses in woodworking, metalworking, machining,and pattern-making applications. 【Easy to usag】:Telescopic bore gauge was used to measure and locks were removed in place and then removed to determine final hole size using a micrometer or calipers.Easy to adjust to allow the most pinhole gauge on the retractable gauge to enter, groove and groove up to 6 inches deep. 【Wide applications】: Telescoping gage set were used to obtain the exact size of holes and slots, which is suitable for factories, schools, offices and other places. Fitment: For Holes, grooves and grooves up to 6 "deep. Material:Carbon steel Weight:0.267kg Color: Same as picture Package Included: 1 * adjustable inner diameter gauge Note: Please allow 1-3CM differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding Please tell us first when you have any problem, we will give you the best service and solve the problem ASAP. Thank you so much. This product is designed and tested to provide the highest degree of performance and usability- under extreme conditions- for demanding users. Thank you for supporting our small business.