uxcell Aluminum Heatsink Heat Dissipation for Solid State Relay SSR Type Product Name : Solid State Relay Heat Sink;Material : Aluminum Thread Size: M4;Total Size (Approx.) : 8 x 4.9 x 4.9cm / 3.1" x 1.9" x 1.9" (L * W * T ) Thread Hole Distance :48mm/1.9" Bottom Mounting Hole Distance:70mm/2.75" Color : Silver Tone Weight : 102g Package Content : 1 x Solid State Relay Heat Sink