Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Do screws screw into the wood or into metal?
Document: I bought this to replace an old metal twin frame in a small bedroom. It fit perfectly in the same spot. It  Wasn't  difficult to assemble. its sturdier than I thought it would be. I left it unpainted and it looks great for the budget price. the 8 in memory foam mattress I purchsed at amazon fit perfect to the frame. No box spring needed.
The bed came within a couple of weeks and was intact. It was very easy to put together and the wood looks very nice. Good buy...
Very nice solid-wood bed for the price. Easy to assemble and sturdy. After staining and finishing, it looks like some of the much more expensive beds.
This bed is beautiful as is, unfinished wood. Its very sturdy and was easy to assemble. All the parts were included and I love it! I would highly recommend this product!
instructions are clear and easy for this self-assembly bed,solid wood construction, very basic furniture, sanded and unfinished woodcarries the mattress weight well
was surprised that it can with the headboard thought that was a optionsome rough spots on the wood that needed to sanded prior to stainingused Minwax al-in-onewould buy againany very well packed
Smoothly finished, simple construction. Slats fit into pockets along side rails. Took about 20 minutes to assemble with included hex wrench and my own phillips-head screwdriver. Poplar wood has nice scent, also! Made in Georgia, USA.
So easy to assemble, sturdy, quality wood, shipped fast, great price. Perfect with headboard for my young son's twin bed with the $100 DreamFoam mattress here on Amazon, upgrading from Ikea crib bed. Top-tier quality, definitely a bargain not to miss.
The bed is well built of solid wood construction. Fairly easy to assemble. While a standard mattress works fine with the frame, it dwarfs the head board. A futon mattress is obviously called for. Nevertheless - excellent quality for the price. Should last very many years to come.
If you realize afterwards that you don't like the setup and that perhaps your mattress is sliding off, don't fret. All you need to do is release the nuts holding the legs in then just flip the base as I've suggested. I sanded the wood and stained it. I sealed it with two coats of polyurethane. Don't know how? Look up "staining wood" on YouTube. It's pretty simple.
Answer: Into wood. It has pre-drilled holes so it was very easy. VERY well made bed. I am so pleased with it.