GrovTec USA 7/8 Machine Screw with Nut and Spacer Features GrovTec is known for manufacturing exceptional quality products. These sling swivel studs are designed to allow the user to attach accessories such as slings and bipods to their firearms. These studs provide a solid platform which will enhance accuracy and your shooting pleasure. Made in the U.S.A. GrovTec USA 7/8 Machine Screw with Nut and Spacer Specifications Brand: Grovtec MFG Product #: GTHM54 48 Pack