This is a Tru-Turn 4 inch Ultimate spinner. It has the lightened back plate and was drilled and cut by Tru-Turn to fit a BME110 and 25X12 Biela 3 blade prop. This spinner can still be drilled for a DA100, ZDZ, DLE 111, ect...This spinner is in perfect condition and has been polished to a chrome mirror like finish as you can see in the pictures.