Projects horizontal and vertical laser chalk Line on surfaces in applications such as floors, tiles, paneling, wall fixtures, wallpapering, stencilling, wainscoting, finish carpentry, outlet switches, lighting fixtures, wall studs, partitions. Alignment guide for 90 degree layout helps you calculate and turn angles in 5 degree increments. Simple one button operation powers two perpendicular laser lines (90 degrees) on and off. Easy to press push button secures unit to smoothsurfaces using non-abrasive adhesive. Specs: two (2) bubble vials for leveling and aligning laser tool. Includes: (1 set) adhesive mounting strips