These Heavy Duty Steel 3-Holed Guy Line Tensioners, sold in fours, are more suited for Hammock Suspension.
 
Great pieces of hardware that also excel at anchoring RidgeLines, Guy Lines etc. You can tighten lines using these with a 3:1 mechanical advantage, and once guys are tied off, they are still easy to adjust. Many uses and ideas can be found via the internet, The Ultimate Hang, YouTube, Hammock Forums etc. 
 
Very versatile, having many uses out and about whilst not needing to remember a book full of knots.
 
Length: 51mm
Width: 37mm
Depth: 2.8mm
Weight: 14.2 grams each
The diameter of holes: 5, 8, and 18mm
Colour: Silver metal