Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What size core does it cut?  i.e the diameter of the corer itself.
Document: Nice size Length and Diameter and suitable for large apples. Good grip so that slipping should not be a problem.
I got this because my husband will not cut up and core an apple. But he's happy to use this. My only issue with it is that sometimes it doesn't get the entire core depending on the size of the apple or if the stem area is lop-sided. He loves it. I use a knife.
Nice sharp apple corer. Works as you would expect. I would have liked it to be slightly larger diameter, but  for most of the apples it removes enough of the core. I would purchase this again.
This Corer is extremely easy to use. you just do a little twisting and it goes through the entire fruit. My only gripe would be that  I wish it were a tiny big larger in diameter. Sometimes I have to push it through an apple 2-3 times to get out all of the core. This is still much easier than doing it by hand though
I found the size of the corer was just perfect to get the core out without taking too much of the apple.
This corer works exactly as advertised, it makes coring the apples extremely easy. The size of the whole seems perfect to get the full core out without taking out tons of extra apple. To me this is fairly straight forward, either it works well or it doesn't, and for me this product works perfectly.
Does just what it's supposed to - cores apples perfectly every time. The size of the corer takes away only the core and the serated edges make it really easy to shove through the apple. The grip makes it very easy to hold and maneuver. Dishwasher safe and a great product - would definitely recommend.
Cleaning the corer is also easy. I use this to core small and medium-sized apples and the core comes out completely. However, I do not think the core will come completely out with larger-sized apples because of the size of the head. Overall, I would definitely recommend this product.
The OXO corer is solid, well made and very close to being just right for its intended purpose (i.e. to remove the core of fruit and vegetables). One minor change would do the trick: It needs to be sharpened! In its current design, the device bulls its way through the item leaving bruised content behind.
I followed the recommendation of Cook's Illustrated in buying this. The corer is so much better than the half circle corer I used growing up. Solid handle is easy to grip and gives you enough torque that it feels almost effortless to use. The hardest part is aiming the thing so it goes through the center of the apple. Also the size of the core extract is a little on the small side for the biggest apples.
Answer: Maybe an inch at most. Honestly I'd like it to be a little bigger however it's really easy to core more of the apple with it.