The 30mm Dynamic Stand Up Block, also known as a foot block or lead block, is a low-profile option for guiding lines to cleats and jammers. Its common uses include leading halyards from the mast base to the cockpit or redirecting mainsheet traveller lines around the cockpit. With dynamic bearings and twin rows of stainless steel ball bearings on a stainless steel axle, this block offers superior rolling speeds and durability compared to plastic options.