40 ST FS - 2-Speed Self-Tailing Manual W" - Full Stainless Steel If you take pride in having your yacht look its best, ANDERSEN's Full Stainless Self-Tailing W" creates the dock-stopping appeal you desire. It combines all the convenience and power of ANDERSEN's self-tailing w" with a stunning all stainless steel look. From top to bottom the drive shaft stripper arm, self-tailing jaws, drum and upper Full Stainless Beyond Good Looks. As with all ANDERSEN W"es , our Full Stainless Self-Tailing w" features the exclusive stainless steel Power Rib drum for maximum power and extended line life. This model also uses our exclusive self-tailing device that automatically accommodates a wide range of different line sizes. Materials Andersen w" drums are produced from grade 316L stainless steel, cold formed in stages during manufacture to further increase strength and hardness as it takes its final form. The resulting construction is lightweight, yet stiff and unyielding. Drive shafts are in grade 329 duplex stainless steel. Pawls are cut from a cold pressed profile in grade 316 stainless steel and are virtually unbreakable. The upper center stems are manufactured from aluminum bronze for ultimate durability. The combination of materials and design contribute to a lightweight, rigid final assembly that enhances. the mechanical efficiency of the w". Andersen winces are of similar weight to w"es with aluminum drums, but are far more durable. Power Rib ANDERSEN W"es feature the Power Rib . Unlike other w"es with abrasive drum surfaces, ANDERSEN w" drums have vertical ribs running up the surface. This combined with the smooth polished stainless steel gives a maximum grip and minimum wear on ropes, reducing the replacements costs of sheets and halyards. What's more, the Power Rib principle simply makes sailing more pleasurable. Fewer turns on the w" make tacking easier. Sheets can be gently eased out without harsh snatching and the risks of overrides and jammed sheets are significantly reduced. The grip provided by the ribs will remain the same year after year, unlike many other w"es with an abrasive or sandpaper-like surface. Such surfaces have a tendency to wear down both ropes and themselves. Power Ratio Power Ratio is the mechanical advantage of the w" and is calculated as follows: length of handle x gear ratio radius of drum The pull of the w" is based on the Power Ratio and not just on the physical size of the w" or the diameter of the drum.