The Equalizer is a very light weight and portable tool. It easily allows any crew member to precisely lay out fence sections equally spaced down to an 1/2 inch. It eliminates the need for a tape measure or complicated math. The Equalizer is simple to use. Just start at the one end post and stretch the cord to the other end post. The tabs on the cord will give you the precise locations for the posts in between. The Equalizer is a must have for any fence company that installs wood fence but also works fence installs of any kind. The cord is engineered to not go over 8 foot centers. The Equalizer can also be ordered for max 6 ft. centers and max 10 ft. centers. Shipping may vary depending on location ($5)