I bought this to add to my new door that was installed 6 months ago. I am an experienced homeowner and well versed in the trades. Since installment the inside knob has fell off 3 times. Both the inside and outside knob are very weak and there is ALOT of wobble to them. Worst door knob I have ever bought, every-time we open our door we take a gamble on if this thing is going to fall apart. Every time we lock it who knows if someone will just rip it off. Horrible and unreliable product- total waste of money.