The Seifert KL-198/63,5/SW with Heatsink is an extruded construction with die-cast black housing and thermally conductive silicone for effective heat dissipation. It is suitable for a range of TO packages, including SOT93, TO218, TO220, TO247, and TOP3. This product is freeze-proof and fire-resistant with a temperature range of -40 to +125 degrees Celsius, resistant to H2S, MIGR, HCL, and creosote gases, and has a conformal coating on the cold plate. The standard version also comes with metric thread base for mounting on pipes and cooling devices. The weight is 156 gm and the dimensions are 148.6 mm (L) × 63.5 mm (W) × 33.3 mm (H).