The mini rail is 1.25 inches / 32mm long overall.
The short rails are 3 inches / 76mm long overall.
The mid rail is 3.25 inches / 85mm long overall.
The long rails are 5.75 inches / 145mm long overall.
20mm wide rail for weaver or picatinny mount fittings.
The mini rail is a compression rail, and will not fit as many rails as the other do.
The short rails have location bars/bolt shafts on the bases with a spacing of 37mm on from inner edge to edge,
the long rails have location bars/bolt shafts with a spacing of 75mm from inner edge to edge.
High quality aluminium alloy construction with matt black anodised finish.
Easy and fast to install for a very sturdy hold from the knurled fixing nuts.