Quickly measure everything from diameter, to grooves, to hard-to-reach recesses with the PROFORM Telescoping Gauge Set. Simply insert the gauge - six sizes to choose from - into the area and turn the knob. The spring-fed arms will snap to outer edges. Now, tighten the knob to lock the inside measurement. Comes with six gauges ranging from 5/16 inch to 6 inches and comes with a durable carrying case. Sold as a set.
Product Details:

• Telescoping Gauge Set
• Six Piece Set
• 5/16 Inch to 6 Inch Diameter Range
• Made From High-Quality Steel Material With Natural Finish
• Includes Blue Vinyl Carrying Case
• Sold As One Set