Navplus Tactical Compact Pistol Rail Red Laser Sight Weaver Rail for Handgun Pistol Constructed of durable aircraft aluminum alloy,output power: 5mW (class IIIa 650nm) User-adjusted Windage and Elevation,Ambidextrous on/off switch,red laser pointer for hand gun Pistol Fits most makes of pistols with a front weaver/pica tinny rail with crossbar slot, 20mm mount It is a snug and compact tactical laser aim assist module that attaches to pistol accessory rails It is aircraft aluminum making it very hardy and the button is a side-to-side ambidextrous bar