With his size and bulk, he's extremely difficult to post up on the block, not allowing opposing big men to back him down too easily, using his terrific length extremely well to contest their shots with both hands, and often being able to send their shots back without even leaving his feet.
Drummond has excellent timing as a shot-blocker, both playing man to man defense on the ball, and rotating from the weak-side. He ranks as the
6th best shot-blocking prospect in college basketball, and is able to do so without fouling very often, committing just 3.2 fouls per-40 minutes.
Additionally, he does a very good job of keeping almost all of his blocks in-play and not just swatting them out of bounds, which gives his team a chance to take possession of the ball.
Not just a presence inside the paint, Drummond is also very much capable of stepping outside as well, being very effective on the perimeter for a player his size. He bends his knees and gets in a low stance exceptionally well, showing incredibly nimble feet sliding his feet and moving in all directions.
His mobility on defense should make him an extremely valuable asset to have in pick and roll situations, as he doesn't seem to have any problem hedging screens and recovering quickly or even switching out and staying in front of guards when the situation calls for it.
Where he will need to improve is on the defensive glass, though, as the 6.0 defensive rebounds he grabbed per-40 minutes
ranked 32nd among the 50 centers in our NCAA prospects database. He does not do a great job of boxing out here and appears to show just average instincts pursuing loose balls off the glass, sometimes being completely out of position and/or going after rebounds with one hand.