Manufactured in Italy by Beneri S.p.A European Leader of Retaining Rings Distributed by Fast-n-rs , LLC located in San Antonio Texas For Shaft Diameter: 3.438 in / Item Free Diameter: 3.179 in / Item Thickness: 0.093 in Groove Diameter: 3.257 in / Groove Width: 0.103 in / Groove Depth: 0.09 in Material: Carbon Steel / Finish: Phosphate / Hardness: HRC 47 ÷ 52 This pack of 75 pcs of External Retaining Rings / Snap Rings by Fast-n-rs is a must-have for any industrial hardware supply. Made of high-quality Carbon Steel with a Phosphate Finish, these rings are built to last and resist corrosion. The rings have a Free Diameter of 3.179 in and a Groove Diameter of 3.257 in, with a Groove Width of 0.103 in and a Groove Depth of 0.09 in. Measuring 3-7/16 in in size, these rings have a Shaft Diameter and Item Diameter of 3.438 in, making them perfect for a variety of applications. These Internal type rings have a Hardness of HRC 47 ÷ 52 and are made in Italy. Ideal for use in Retaining Rings, Fasteners & Hardware, and other business and industrial applications, these rings will provide the needed security and durability.