6 Piece Telescoping GageSet by Fowler. Range: 5/16"- 6" with measurable depths of 4"- 5". Constant spring tension, contact points are hardened tool steel. Under spring tension the plungers of the gage expand from the center to the size of the hole being measured and are then locked in place using the knurled knob. Final hole size is obtained by measuring over the contacts with a micrometer.U.S. shipping via UPS Ground. International shipping via USPS Priority. See shipping details.We also ship APO, FPO and do combine shipping. As always we appreciate your business. Check out my other items! Sign up for my email newsletters by adding my eCRATER Store to your Favorites. Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eCRATER Marketing, eCRATER listing Apps, eCRATER Apps, eCRATER ApplicationFroo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eCRATER Marketing, eCRATER listing Apps, eCRATER Apps, eCRATER ApplicationFroo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eCRATER Marketing, eCRATER listing Apps, eCRATER Apps, eCRATER Application