Holland's perfect everytime scope mounting fixture, allows an individual to install the scope reticle absolutely perpendicular to the bore. Say "goodbye" to canted reticles and dissatisfied customers. Simply mount the rifle in the fixture, set the magnetic level on the scope base and use the adjustment screw to bring the base to "perfect level". Mount your scope and align the reticle using a string and plumb-bob. Tighten ring caps and confirm. This fixture is a "must have" for gunshops, gunsmiths, and will quickly pay for itself in the first few scope mounting installations. The fixture comes complete as you see it. Be sure to also check out Hollands's scope level (it is the official scope level of the USA F-Class shooting team) this allows the shooter to maintain reticle perpendicularly when shooting in the field. Holland's “the finest scope mounting fixture that is fast and easy to use.” Why pay someone to mount your scope incorrectly when you can buy Holland’s Perfect every time Scope Mounting Fixture and do it for yourself and others. With a little practice, you can mount your scope perfect in less than 5 minutes.