Bosch Laser Level GLL50 20GL Green Beam Cross Line (65 Ft Range VisiMax Telemetry Rechargeable Li Ion Dual Power IP55 Magnetic Base Layout Kit) Rotary Hammer Bit guiding the spinning shaft stabilizes guiding the spinning shaft stabilizes long screws and prevents bit wobble during high speed deck installations and a 12 position Vario Lock™ chisel collar 0 Ah rechargeable lithium cell pack (supporting simultaneous charge and run utility) or standard AA alkaline power trays The Bosch GLL50 20GL Green Beam Self Leveling Cross Line Laser Level Kit delivers specialized structural layout telemetry and exceptional alignment leveling accuracy across active indoor installation frameworks