Features: Brand new and high quality SSR single-phase solid-state relay cooling base fits for solid-state relays 10A-40A. Made of durable aluminum material, mountable heatsink design, compact size, easy to install. Heatsink only, Solid State Relay is not included here. With a switch, no spark, no noise, high switching speed, anti-corrosion, moisture-proof, anti-vibration, long life, high reliability, electromagnetic compatibility, and other characteristics. Solid state relays are ideal for automatic process control applications and are a must-have component for temperature controllers and other machine control systems. Package includes: 1 pc x Solid State Relay Heatsink Specifications: Material: Aluminum Fits for: Solid State Relay 10A-40A Mounting thread diameter: approx. 3.6 mm Base mounting hole size: approx. 7x5mm Size Foot: approx. 80x50x50mm/3.15x1.97x1.97in Color: Silver Note: No retail package. Please allow 0-1 cm error due to manual measurement. Make sure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!