The 6399BG is a 25.4mm extruded Heat Sink with aluminium, black anodized, large radial fins and straight pins, 3.3 thermal resistance.
The MC33266 is a vertical-mounting extruded Heat Sink designed for a single TO-218/TO-220 package.
The MC33270 is a 50.8 x 25 x 42mm high power dissipation vertical mounting extruded Heat Sink with black anodized finish, solderable fixing pins and a notched base. It can be mounted through mounting holes and is suitable for use with a single TO2-18 TO-220 and TO 247 devices or via clip available separately.