This is the ABMAT Landmine Grip: a neat accessory that improves your grip and protects your hands during landmine exercises. It slides onto the end of a Olympic barbell and covers 7 inches of it. It is made with high density foam. It can be used for trigger point therapy too.
This grip turns your 2-inch diameter barbell into a 2.6″ one that is foam covered, so you can comfortably handle it.