Review on IRWIN Tools Hexagonal 8 Ounce 13085 by Bryan Gallardo

This is a simple device. The top unscrews and the cord is passed through the top and held in place by a knot. Makes a true vertical line due to gravity. The end is very sharp and pointed. High quality. The line is not included. Don't try to use it in space, otherwise it will turn into a large volatile mass.