Heavy-duty double-Prusik-Minding Pulley Weight: 500g (17.6oz.)|Strength: MBS: 50kN (11240lbf)|Aluminum body with Stainless Steel sheave|Fully load-rated becket with large opening to allow movement of carabiner|For use with single ropes up to 13mm (1/2")|Roller bearings are ideal for low loads at high speeds|Tamper-proof rivets|Certifications: CE EN12278, NFPA 1983