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I am trying to replace my bathtub drain however the cross bars have broken off so I am unable to unscrew it from the tub.
How can I unscrew it?
EDIT:
This is approximately the product I am trying to install: drain
On the packaging it says to use pliers to grab the cross bars of the old train in order to unscrew it. The drain is supposed to look like this:
But the cross bars have broken off.
Get a drain key and a crescent wrench it will expand in the hole giving you friction to turn the drain out.
I don't know for sure what you mean by cross-bars, but bathtub drains are not usually removable (at least not w/o destroying the drain) from the end user side of the tub, and it's virtually IMPOSSIBLE to tighten the drain sufficiently from the "sit here" side of the tub if you were able to remove the old one.
Have a look at this typical example of a tub drain:
As you can see, the drain assembly is affixed securely to the tub with a wide nut, designed to be removed from underneath.
You'll need to get access to the back side of the tub - hopefully there is an accessible panel you can get at - otherwise that usually means cutting a hole into the wall behind the tub.
I tried using a tub drain remover wrench and all it did was break off the cross bars. So I found a 1 1/2 inch PVC pipe and it was almost the right diameter, but it didn't have any bite. Then I drilled a screw into the side and wedged it between the PVC and drain and with a few pulls of a wrench, it started to unscrew. Hope this helps. 
My cross bars were broken totally... So there was just the round cylinder. I took a sturdy hammer and by putting the claw end inside the cylinder, you can then pull or push the claw into the side of the cylinder. Keeping the pressure applied, turn the hammer's handle and believe it or not it will turn the cylinder. Some people put the claw on the bottom of the cylinder but I found it easier to dig the claw into the inside of the cylinder. Easy peasy, no tools to buy.
If the cross bar is broken, then you need to bend the outer lip of the drain up. It will be a witch of a job.
Use needle nose pliers to start. Once you can get the lip bent enough, use some channel locks and work it off. The top drain just screws into the lower part. Just keep working it. I did this about 3 weeks ago and at one point I replaced the channel locks with vise grips then used a hammer to push the grips. I also sprayed some WD40 under lthe lip too. It took me 2 hours to get the original drain out, and then about 5 minutes to install the new drain. Can you say miller time?
One way you can fix it is by tapping in a 23mm socket into the drain. Then attach a ratchet to the socket and twist it out.
I didn’t realize at the time that there were special tools for this job so I made my own. What I did was clamped two short 2 x 4 blocks together side by side and then cut a hole in between the two pieces using a 1.5 inch hole saw. When I finished I had two half circle pieces of wood the thickness of the 2 x 4. I then put the blocks together and glued 60 grit sand paper to the outside. Then I put the block into the drain and drove two screws into the crack to expand the block and put pressure on the inside of the drain. Finally I placed a chisel into the crack of the blocks and used large pliers to twist the chisel, block, and drain. First I tried twisting on the screws but they broke off. While I’m sure the special tools work great this can be assembled fairly quickly and inexpensively using stuff most folks may already around the house.
I had this exact problem on a 30+ year old drain with broken crossbars. The lip decided to break off little by little (nothing left of the lip when I got done with it), leaving the threaded drain part screwed to the pvc underpipe only. I grabbed the frayed part of the top with a tweaser pliers and worked on this bad boy for a few hours at least (on and off)..with all my might. It did take an hour or so for a few days, then after I waited a few more days (while I called the plumber), I was able to unscrew the drain. Definitely a frustrating experience, but gratifying in the end:)
