2 Pack, White, Corner Tensioner, Fit All 112 Poly Tape, For Use With Wood Corner Posts Line Posts, Stainless Steel Triangular Tensioner Holds The Poly Tape Tight, Deters Tearing From Impact Allows Easy Retightening If The Poly Tape Becomes Loose Due To Impact Or Stretching From Snow Ice Load, Swivel Back Forth Rotate Around The Plastic Insulator Post Bracket Allowing For Up Down Grade Changes, This Prevents The Tape From Bunching In The Tensioner