Not fair to say much I bought this item in error delivery was ok considering it came Singapore. If you require fitting instructions they are readily available on the internet. Worth noting that in cross reference I made an error that's how I ordered the wrong component,just beware of this trap.
Worth the changing to these locks if only for peace of mind,also you may get a discount on insurance when changing to three star approved locks. They are so easy to change it's only a few minutes of a job.
I woud stick with original blades as stated by others cheaper versions don't last.Have tried non-genuine and found that they just kept failing whenever they hit thicker clumps of grass .One pair of these blade will cope for the whole grasscutting season,no problem.