Oil filter heatsink from Sickspeed. Keep your oil cool with this innovative new part from Sickspeed. Each Fin / Heatsink is 9.81mm deep (.3 inches). Lower engine oil temperature's mean longer engine life. Overall outside diameter of the heatsink is 101.6mm (4inches). Adjustable size from 73mm (2 3/4 inches) to 76.3mm (3inch) diameter. Made from weapons grade billet aluminum to withstand the test of time. NOTE: This is not an OEM part , this item fits most aftermarket oil filters.  Please double check your sizing and clearance before you purchase this item. NOTE: Purchase includes the heat sink ONLY, NO filter is included. Don't forget to check out our other listings for parts and accessories to suit your ride. We are always expanding so keep an eye out for more supreme quality products from Sickspeed. Purchase includes a die-cut vinyl decal: Check out the manufacturer's website for more info and pics.