This picture of me leading Numbskull's Needle and the climb itself seem to be designed to confuse.
The first bolt is about chest high and the second is at your waist where you would never expect to see/find it. The first two bolts basically do nothing to protect bouldery moves off of ledges/decks (other than maybe to keep you from going "all the way").
All three lead bolts and one of the anchor bolts appear to be old hardware store junk (wedges?) and are sticking waaaaaay out.
No way to tell how much of the bolt is actually embedded in the rock - my best guesstimate is an inch to an inch and a half.
EDITED - this photo was corrected/rotated courtesy of beano - thank you!
Here is bolt 1 close up. At first glance the start doesn't look that bad but it is harder than it looks and very committing on some pretty lousy rock. Use your own judgement before bouldering up on it and good luck.