well shuttle t's are 1 1/8 inches and the holes end up being way bigger then that, also just getting bigger blades isnt gunna have as good penatration. my shot blow in and out of the deer and stuck into the ground, the shape of the blades end up cutting a way bigger hole then what the blades actually are. on each the left and right side of the rib cage was just blown to bits. im telling ya these are the real deal.