Kasp 170 series brass shutter locks kasp k17090d kasp 170 series 90mm brass shutter locks have rotating hardened steel shackles for extra protection against hacksaw and cropping attacks 5 pin cylinders with anti pick mushroom pins for extra protection against picking and a paracentric keyway for extra protection against manipulation their solid brass bodies give added resistance against corrosion they are covered by kasps 10 year guarantee kasp k17090d brass shutter lock 90mm