Fischer Elektronik Sk 481 50
HEATSINK; Thermal Resistance:4.5°C/W; Packages Cooled:TO-3P, TO-218, TO-220, TO-247, TO-248; External Width - Metric:30mm; External Height - Metric:45mm; External Length - Metric:50mm; External Diameter - Metric:-; Heat Sink Material:Aluminium; External Width - Imperial:1.