Uxcell a12110900ux0388 Aluminum Heat Sink for Solid State Relay SSR Heat Dissipation Product Name : Aluminum Heat Sink; Material : Aluminum; Fit for : Solid State Relay 10A-40A Mounting Threaded Hole Diameter (Approx.) : 3.6mm / 0.14";Threaded Hole Distance : 48mm / 1.9" Base Mounting Hole Size : 7 x 5mm / 0.3" x 0.2"(L*W);Size Roof(Approx.) : 60 x 50mm(L*W) Size Foot (Approx.) : 80 x 50mm(L*W);Color : Black Net Weight : 100g;Package Content : 1 x Aluminum Heat Sink