Edge-mount clamp-on incandescent swing arm lamp features a 30" reach spring-balanced swing arm that directs light right were you need it. Attaches to surfaces up to 2" thick with a metal clamp. Fingertip locking knob prevents arm from swinging once you've set the lamp to your desired position. Swing arm lamp includes a convenient rotary on/off switch and uses a 60 watt incandescent bulb, sold separately.