Anti climb prison duct is manufactured from spiral lockseam ducting and is used for the purpose of the last line of security atop perimeter fencing surrounding correctional facilities. Prison duct is easily assembled and secured on site during installation and is large enough in diameter (usually 900mm or larger) to prevent anyone scaling the wall during an escape attempt. Prison duct is mostly supplied in a designed colorbond steel material to have a long lasting aesthetic appeal in keeping with the surrounds of the prison location.