TufForce Adjustable Angle Mount, 40-90 Degrees, MT-2D5F, 5 Slots, USA Patent Granted Tufforce Micro Angle Mount, from 40 to 90 , two levers available as pictures to show 5 slots on rail, 2" / 55 mm length for laser , front sight, ..... Two M4 screws clamp rail on the 35 mm rail base, tighten by one nut , solid Premium Aircraft Aluminum, 6061-T6, Hard-coat Anodized Finish, Black Tufforce unique original desigh, USA Patent Granted, see fufforce's w be for more and newest