The Kley-Zion Buffer Tube Buddy was designed for assembly and maintenance of the AR15/M4 lower receivers. Features/Specifications: Will work with both mil-spec & commercial buffer tubes Mounts receiver in 12, 3 , 6 or 9 o'clock positions Two polymer screws firmly holds buffer tube in position. Mounts in any vice 6061 T6 Aluminum Clear, Type II class III hard Anodized Only, 3.5" wide, 6" tall Lightweight only 11.6oz Lifetime warranty 100% Made In USA