Callfire@red Laser Bore Sight Kit Boresighter for .22 to .50 Caliber Scope Handgun Rifles Weight: 150g Wavelength: 650nM Power&lt;1mW (Max.output: 1mw) Length: 155mm. Head Dia.16mm, Tail Dia.5mm Four bore adjustable adapters to fit all 0.22-0.5 caliber