Liquid Force's new Inline shaper is designed to fit radically stepped hulls with narrow strakes and heavy curves. 5 inline 2 inch rubber suction cups securely grip the hull and wont damage gel coat or leave black markings on your boat. Easy to adjust on the fly, No ugly Velcro or safety tethers required.Boat Compatibility:The Wakesurf edge Inline Shaper will work on almost all inboard boats and is designed to fit hulls with more complicated surface designs. The shaper needs a flat surface measuring 3" tall by 13" long. If there is a lip/step above the attachment area on your hull that protrudes more than 2", then you will need a little more space. If your hull has an outward curve of more than 1/4" over 5", this shaper is exactly what you need!