Specs. 

Power: <1mW Class II Laster

-T6061 High class aluminum alloy in beautiful black matte

-7 bore adjustable adapters to fit all .177-.78 caliber

-Screws already are set in the factory when center aligning.

-For any 0.177 to 0.78 handguns, rifles, sights and riflescopes

- More convenient and accurate than scope and sight alignment. Easy to Use!

- Battery: 3pcs AG13 (LR44) Not included / Not included / Not included

- Length: 150mm, Head Dia: 16mm, Tail Dia: 4mm

Style Choice: Style 1 / Style 2 ( Choose Carefully)

Note: Just 2 kind of different ways to install the battery,  others are all the same.

Package:

1 x Laser Bore Sighter

1 x Screwdriver

1 x Allen Wrench

7 x Adjustable Adapter

Photos.

Style 1:

Style 2: