If it's a 4ft 1in diameter hole it will not fit inside a 4ft dia hole as the outside is bigeger than the inner. Inner outer, outer inner. That Sunday in Tamworth.
Ok then, go to the cupboard - see that large bag of funny looking mushrooms your mate gave you - throw them in the bin, they're not good for you. Mushroom fact of the week.
If a hole 4ft is wide you drill is it will? Only if it will is of the drill is wide is if is hole will, obviously.