The screw ons come in three packs for the benefit of carbon arrow shooters. A compound hunter field dressed and carted a deer out that my wife shot, with an original Grizzly and the next year, he helped with one shot with with an Eskimo. He explained that he did not understand how she could get so much power out of her arrows, because his mechanicals never did what her's did. He got the Zwickeys, then before the next deer season, he got a recurve, then he had me make him some wood arrows, then he came over and asked he could borrow my cargo trailer and deer cart. This year I ran into three compound shooters, two using Zwickey Eskimos, word gets around and all kinds of things happen. One asked if it would be possible to shoot a deer with a Bear Super Grizzly, because he just bought one, from a tree stand. I told him, yes, with a bit of a change from how you shoot. The crazy buggers hauled a ladder stand out of their pickup and tied it to a power pole, illegal. I had three blunts, I asked, "How far are you from your deer trail?" One paced off 15 yards and set a water bottle down. I hit it twice with my severely canted longbow and close with the third. A couple of weeks ago the third came by asking for sharpening instructions. He was going to put some on his carbons. He was shocked how easy it was to make, his words, 'antique crap work so good'. I let him shoot a Pro Hunter Wing that came back to me, after some instruction. Then showed him some wood arrows with Eskimos, hills, Grizzlies and Rib Tecs on them. He had never handled a wood arrow with a broadhead before. I love that glazed eyes look that the young hunters get when they have their first contact with traditional archery.