Heatsink base. Convert your three phase current input into DC with this Bridge Rectifier. This bridge rectifier can be used in a wide variety of applications. Product Name : Bridge Rectifier Model : -QL100A/1200V Output Current(DC) : 10A Repetitive Peak Reverse Voltage(AC) : 1200V Fixing Holes Diameter : 5.5mm / 0.22 Inch Fixing Holes Spacing : 54mm / 2.1 Inch Main Body Size : 98 x 59 x 28mm / 3.86 Inch x 2.3 Inch x 1.1 Inch (L*W*T) Overall Height : 52mm / 2 Inch Material : Aluminum Casing Color : Black Net Weight : 228g/Pcs Package Content : 2 x Bridge Rectifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.