What equipment do you need for the Dumbbell Seated Overhead Tricep Extension?

It uses dumbbells. Without it, the Barbell Skullcrusher and the Cross-Body Cable Tricep Extension train the same muscles the same way.

Is the Dumbbell Seated Overhead Tricep Extension good for beginners?

GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Band Tricep Kickbacks.

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An overhead extension that puts the long head of the triceps on full stretch — the go-to seated arm-day isolation lift.

Sit on a bench with back support and hold one dumbbell vertically with both hands cupping the top plate.
Press the dumbbell straight overhead with arms fully extended and elbows close to your ears.
Brace your core and keep your back flat against the bench throughout the set.
Lower the dumbbell slowly behind your head by bending only at the elbows until you feel a deep triceps stretch.
Pause briefly in the stretched position, keeping the upper arms still and pointing straight up.
Extend the elbows to drive the dumbbell back overhead, squeezing the triceps hard at the top.

Letting the elbows flare wide, which shifts load off the triceps and into the shoulder joint.
Moving the upper arms forward and back instead of keeping them locked vertical, turning the lift into a press.
Cutting the bottom range short and missing the deep stretch where most growth happens.
Going too heavy and dropping the dumbbell down hard, which puts the elbows and back of the head at risk.

What muscles does the Dumbbell Seated Overhead Tricep Extension work?: Mainly the triceps.
What equipment do you need for the Dumbbell Seated Overhead Tricep Extension?: It uses dumbbells. Without it, the Barbell Skullcrusher and the Cross-Body Cable Tricep Extension train the same muscles the same way.
Is the Dumbbell Seated Overhead Tricep Extension good for beginners?: GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Band Tricep Kickbacks.