The KAK Industry Multi Position Dimple Drill Jig is precision-engineered for .750" barrels and built from 4140 thru hardened steel with a durable phosphate finish.KAK Industry Multi Position Dimple Drill Jig4140 thru hardened steel construction for maximum durabilityPhosphate finish for corrosion resistanceDesigned for use with .750" barrelsAmerican-made quality at affordable pricesThis professional-grade drilling jig provides precise repeatable dimple placement for gas block installation and other barrel modifications making it an essential tool for gunsmiths and firearms enthusiasts.