3PCS big Bolts don't line up with holes of 40t sprocket,unscrew the 2pcs small bolts to 1 inch adapter, it will line up. this is is unique and special design ,not wrong drill
The Adapter fits 1.25 inch rear hub of SPOKE WHEEL BIKE with a diameter of 1.21"to 1.25" (FOR SPOKE WHEEL BIKE ONLY)
Does not works with 9 hole and 6 hole sprocket, Only fit spoke wheel bicycle;