Madewell Screw Piles Our focus is the residential & light commercial markets. Our screw piles are made with the highest quality 450+ grade steel.75kn - 100kn. 10-inch diameter, larger diameters available also.We specialise in blade pile design which gains the required torque faster.Single, dual & triple blade piles are available. Traditional helical screw piles are available also by order. Request More Information