Constructed of metal tubing, a nylon bushing and steel tensioning spring Tubing comes in an unfinished, corrosion resistant, milled finish Designed for use with vertical sliding, single hung and double hung windows that are equipped with spiral balances like these Features 2 available rod extensions Easy to install with only a few simple tools Please refer to the line art drawing for dimensions and compare with your needs before ordering Prime-Line part H 3787 tilt balance tension tool can be ordered separately Please refer to the line art drawing for dimensions and compare with your needs before ordering