Set universal stand offs to put dual carbs on a Kohler Command 18-30hp horizontal engine. These are machined from a solid piece of 6061 aluminum. They measure 2-1/2 out from the face of the block and include a universal boot for any carb with a 40MM spigot size. Both of them have 1/8 NTP thread in the body for fuel pump pulse. Comes with two stand offs, 4 mounting bolts, one plug and one hose fitting, 2 boots and bolts.