Muya G31020 Mini-Prism Features a 25.4mm prism accuracy of <5 second, copper-coated or silver-coated prism for option. Tilting holder made of anodized aluminum, the assembly is constructed of aluminum and brass. Has a 0 or -30mm offsets. Includes a side-mounted 40 minute adjustable vial. Kits includes s-hook, plum bob bracket and plum bob, so that fit any other accessories. Comes with a bag and inner box.