The UNION Hercules 1K57 padlock has a vertical sliding shackle which comes through the staple hole making direct attack impossible Insurance Graded CEN6 and accredited Sold Secure Gold this lock is ideal fo use in commercial or high security applications Supplied with 3 keys AVA Available with AVA 10 disc Key retention when the padlock is unlocked Hardened steel unsprung shackle Suitable for use with UNION 7B018 padbar Anti Drill Anti Saw Force Resistant Anti Pick Torque Resistant Corrosion Resistant Specification Shackle type - Concealed Shackle diameter - 16mm Shackle clearance - NA Locking mechanism - Key