Features: and SSR single-phase solid state relay cooling base suit for solid state relay 10A-40A. Made of durable aluminum material, mountable heat sink design, compact size, easy to install. Heat Sink only, Solid State Relay 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 relay ideal for automatic process control application, a must component for temperature controller and other machinery control system. Package Includes: 1PC x Solid State Relay Heat Sink Specifications: Material: Aluminum Fit for: Solid State Relay 10A-40A Mounting Thread Diameter :approx. 3.6mm Base Mounting Holes Size: approx. 7x5mm Size Foot:approx. 80x50x50mm or 3.15x1.97x1.97in Colour: Silver note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.