A half inch diameter shackle made of superior steel is what sets this lock apart. A reinforced sleeve-over-crossbar construction adds exceptional strength. Impervious, anti pick/pull/drill, dual steel ball locking M-cylinder mechanism with an integrated dust & water cover. White LED spotlight on main key and 4 spare keys. Includes disc reminder and belt clip carrying pouch. Also includes an anti-theft protection warranty. 4.3"×4"×1.3". 3 lbs.