This listing is for one set of Rotary Lift T100271 Truck Adapters with 1 1/2" pin size for newer lifts withTrio arms. If you have the older 3 stage arms see our other listings for the 2" diameter stack adapters (FJ7880). These are original unused adapters sold by Rotary Lift. This is not an after market reproduction. This kit consists of (4) 3 1/2", (4) 5" adapter extensions and mounting bracket. These adapter extensions provide additional lifting height when vehicles require additional clearance or use on one end to level vehicle on lift. Rotary Lift T100271 Adapter Extension Set 1 1/2" Diameter Fits SPOA10 lifts w/ 3 Stage arms 800 Series And above and SL210-1000 series With Trio Arms