Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can I just use the end of the slats to sit on the side rails of the frame without having to drill holes?
Document: I bought these for our spare room bed which had rails but no support system. (The rails were attached to the headboard and foot board and the bed collapsed several times) I thought they were a little pricey but they were the only thing I could find that looked like they would work for my frame without buying a whole new frame. When they came, the instructions said that they were for a wood frame. Well, I had metal, but they worked.
these adjustable slats are just what I needed for a platform bed frame I built. Slats are made so the each end of the slat is formed into a flat mount where you can either secure to a metal frame with bolts and nuts or secure with wood screws onto a wooden bed frame. Adjustable support legs two to each slat has plenty of length to be adjusted for either a lower bed frame or up to 15 inches for a raised frame. Well worth the money.
I ordered these for under a king bed. They are really sturdy and work great. My hubby had to get his drill and some special metal screws to attach them to the bed as the sideboards were metal, I am not sure the normal person could do this. They would work great with wood sideboards without any extra work!
Attached easily to the wood side rails of our king sized bed. Adjustable legs can accomodate a variety of bed heights. Can be used on any size of bed from a twin to a king. Only issue was the rails were shipped taped together and the some of the black paint came off the rails when the tape was removed. Rails are under the bed and cannot be seen so it was not an issue for me.
My Cal King Bed mattress was too high with the box springs and wanted to lower the mattress without the box springs. So I  bought two set (2 each in a set) for my Cal King bed frame. I was not sure if this would work, since there wasn't too much information on Amazon about it. And also, the spec's that was posted worried me a bit too. I needed a slat that would be 73 inch wide and the spec's on Amazon stated max 66 inches.
The night I installed these bed slats was the first good night's sleep I had had in that bed in three or four years! I would recommend these highly to anyone who will listen to me. The bed frame is even sturdy now. I am very impressed.
One commented that it would fit the Cal King bed frame, but didn't know for sure, because they used their slats for a Queen size bed frame. But I took a chance and figure if these slats don't fit my Cal king bed frame, I would either return them or sell them on Craigslist. The slats come a week later after I order it and to my surprise, these slats were easy to assemble and I had my son measure the slats.
As a few others wrote, the box came looking like it had come through a war zone; but all the pieces were there and the slats were  undamaged. It took maybe 8 minutes to install and I cannot say enough about what a difference it made in my bed. I have a very old four-poster bed and a twelve year old mattress. The bed frame was fairly wobbley and I could not get regular wooden bed slats to stay in place.
wide is 25 1/4 inches and the max. wide is 90 1/4 inches. No problem fitting in my Cal King bed frame. Plus it has two adjustable leg support with nylon bottoms for each slat and if you need it longer, they comes with leg extenders for each slat. It has one screw hole on each end of the bar to secure it to the wooden bed frame. All the hardware are included with each set.
Very easy to set up. So much better than wooden slats that slip. Would recommend to others. Less expensive than others I looked at.
Answer: Yes. I have them screwed in to make sure they are sturdy and dont move since it ison my sons bed and he constantly jumps into his bed to get in it.