The Allen 20mm Dynamic Stand Up Block, also referred to as a foot block or lead block, offers a sleek and efficient method of leading lines to cleats and jammers. It is commonly used at the base of a mast to guide halyards towards the cockpit, or to redirect mainsheet traveller lines alongside the cockpit. This block features twin rows of stainless steel ball bearings on a stainless steel axle, providing unmatched rolling speeds and durability compared to plastic options.