The Leclerc tension box can be used to provide proper spacing and tensioning during sectional warping. It has an adjustable brace which allows it to be mounted on almost any flat back beam up to 3 3/8" wide. An open-topped 12-dent reed section is mounted at each end to allow for spacing of the warp. Four tensioning dowels can be placed in various configurations to control the tension. The tension box is made of maple wood and is pre-drilled for the optional yardage counter. The tension box comes with two 12-dent combs. Additional combs can be ordered in 6, 8, 10, 12, or 15 dent.