The Left-Hand Ascender is machined from solid aluminum for heavy-duty use and maximum durability. Weight: 350 grams (12.3 ounces)|MBS: Dependant on Rope Type|For use with single ropes from 9 - 13mm (5/16 - 1/2")|Stainless Steel cam with cones (instead of spikes)|Primary & Secondary attachment holes|Gray with Red Handle and Thumb Catch|Certifications: CE EN567, NFPA