5/16-18*3.14/80mm Standard ASIN dental distances, such as: 1/4-20, 5/16-18, 3/8-16,1/2-13，5/8-11，3/4-10,7/8-9,1"-8, the screw length is marked with metric (mm) and American (in) conversion, making it easy to purchase 5/16-18*3.14in Fully All Threaded Rod, UNC Long Threaded Screw, Right Hand Threads, 304 Stainless Steel ,Various size, quantity, length,ANSI Standard Material: Made of 304 stainless steel, ductility at high temperatures, and low magnetic permeability. 5/16-18*3.14in Fully All Threaded Rod, UNC Long Threaded Screw, Right Hand Threads, 304 Stainless Steel ,Various size, quantity, length,ANSI Standard