BS4  Mechanical Arbor Deluxe Kit 
This bore sighter kit uses a 4-piece  stud set to ensure precise bullet placement from the start.
With selectable studs, you are assured a sung fit in the rifle barrel, eliminating the play that cause inaccurate bore sighting. 

Item	BS4   3 Mechanical Arbor Kit
SPEC.	Bore Sighter with 3 pieces adjustment stud tools; with carry case. - Adjustable studs include following sizes :    0.22 ~ 0.27 ; 7mm ~ 0.35 ; 0.35 ~ 0.45 ; - Coming with a multi-pocket soft case