John, they are tapered (countersunk) 6X100X14. I use stainless steel Philips available at any good hardware store. No rust no fuss. They only hold the drum on till the wheel is lug nutted tight.A "Helpful" mechanic did not replace (lost) my 2 attach screws on each drum. They say consistency counts. So now I need 8. Any one know a size and or source on these little dears?