Description
10 hole Reference Standard 4340 or 4130 Carbon Steel. Contains 10 hole sizes; 1/8, 3/16,1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 3/4 inch diameters.( .030″ x .030″ +/- 10% x .006″ +/- .001″ Wide Corner EDM Notch and 3 Surface EDM Notches at .010″, .020″, …