The Aimpoint T1/T2/H1 Micro Mount 1 Piece is a one piece unit that places the optic in a Lower 1/3rd Co-Witness height. Centerline height with the T1/H1 Optic is 1.6". This mount also fits the Vortex SPARC and Primary Arms Micro Dot (will not Co-Witness with iron sights ). It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems.