This rolled stainless sail track is commonly used on wooden spars in conjunction with 7/8" external slides. Makes hoisting the sail up and down the mast possible. 7/8" Stainless Sail Track. Sold in 6 ft. lengths. Predrilled 1/4" holes, 3 1/2" on center. Use 10 x 3/4" screws. 24 screws per section.