Saim Black 3 Pc. Aluminum Heatsink Heat Dissipation Sink For Solid State Relay. Product Details Aluminum heatsink are generally used in the heat treatment and the solid state relay. The fins increase the area of the board and thus provide for greater heat transfer. Made of durable aluminum, highly reliable and easy installation. Heat Sink only, Solid State Relay NOT INCLUDED here. Come with a aluminum heat sink provides long lasting usage, it will help dissipate the heat and protect your relay. Mounting Hole Dia :4mm/0.15";Mounting Hole Center Distance : 48.5mm/1.9" Material : Aluminum;Main Color : Black; Total Size : 12.5 x 5 x 7cm/4.9" x 1.96" x 2.75"(L*W*H) Designed specially for single phase solid state relay, a must component for temperature controller and other machinery control system. Net Weight : 583g; Package Content : 3 x Heatsinks,6 x Button Head Screws Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.