Bridge Rectifier Heatsink Square Basket Screw Mount (MP1018). This black anodized aluminum square heatsink is 26.92mm Width x 26.92mm Length x 31.75mm Height and has a 0.142 diameter mounting hole for attaching to the bridge rectifiers. Always apply non-conductive thermal paste between the heat sink and the bridge rectifier before mounting the heatsink. Thermal Resistance is 9.4 °C/W. These are great for the 35A and 50A bridge rectifiers on our site and recommended for use on all the Williams Arcade and Pinball power supplies and any other applications that use the higher amperage bridge rectifiers. MAKE SURE TO GET THE MP1018 HARDWARE KIT FOR MOUNTING THIS HEATSINK.