Marius,back in the 70's,Browning(the same Browning that makes firearms) marketed a heavy screw-in type broadhead with a helical twist.I was shooting glass recurves back then,and a guy gave me 3 of them.I bought some aluminum shafts ,to test these wicked looking points,but could never find a way to make them shoot well.I found out real quick why the guy gave them away .The idea looked neat though,like it would "drill" like a brace and bit,a hole 1-1/4" across. God Bless