All steel stainless one inch projectionless rings and two piece stainless bases, appear to be made by Conetrol, S&K or maybe factory Kimber, 8-40 screws, i understand they'll fit both 84 and 8400 actions, according to the height of the rear rings they have to be lows, all pieces accounted for, they came on a Kimber Montana 257 Roberts i bought here, 100 bucks shipped, first i'll take it gets em.