Measurement: 20g (0.8 mm) and 22g (0.7 mm), Diameters: 3/8"(10mm), 5/16" (8mm), 1/2" (12 mm) . Each comes with a total of 7 pieces in two gauges each with 3 lengths. Easy to use and have smooth surface Shipping and Returns We are a U.S. based seller and all of our products are shipped from the United States. You can return any product within 30 days from purchase date. We Care And Will Reply Within 24-48 Hrs!