28 inch HyperSpin P Series Wind Turbine Blades (Set of 3) Three 28 inch wind turbine UV-stabilized polycarbonate blades Choose a 3/16 inch thick stainless steel mounting hub with 17 mm or 1/2 inch mounting hole diameter! 9 sets of stainless steel fasteners These blades are designed for small wind turbines that are typically rated for ~200 to ~600 Watts You will not be disappointed with our blades!