BEST KD303 9K Door Handle Drill Jig for Cylindrical Lock InstallationThe BEST KD303 drill jig is a specialized installation accessory engineered to ensure precise alignment of 5/16" through bolt holes for 9K cylindrical lock mounting. This professional-grade jig inserts into the standard 2-1/8" bored hole and aligns with the door edge to guide accurate drilling with a 5/16" bit, eliminating guesswork and ensuring proper lock installation every time. Part of the BEST KD Series, it is built for locksmiths and contractors who demand consistent, repeatable results on commercial door preparations.Key FeaturesPrecise Hole Alignment: Ensures accurate 5/16" through bolt hole placement for proper 9K cylindrical lock mounting and operation.Standard Door Compatibility: Designed to fit standard 2-1/8" bored holes for universal application across door preparations.9K Series Compatibility: Specifically engineered for BEST 9K cylindrical lock installations with proper bolt alignment.Durable Construction: Built to withstand repeated professional use in demanding installation environments.Time-Saving Design: Streamlines the installation process by providing an instant alignment reference for drilling operations.Professional Installation Tool: Eliminates measurement errors and provides consistent results for locksmith and contractor installations.Technical SpecificationsPDF:D Series Service Equipment: https://.com/content/pdf/best/BA-0032_BEST_D-Series-Catalog-04-23.pdfParts and Accessories Type: Installation AccessoriesProduct Attribute: Parts and AccessoriesProduct Category: Door Trim and AccessoriesProduct Group: Parts and AccessoriesProduct Model: KD303Product Subgroup: Parts and AccessoriesProduct Type: Cylindrical/Tubular EquipmentSeries: KD SeriesSubcategory: Parts and AccessoriesTypical ApplicationsLocksmith Installation ServicesCommercial Door Hardware InstallationInstitutional Facility MaintenanceSecurity System Integration ProjectsBuilding Contractor Door PreparationProperty Management Lock ReplacementEducational Facility Hardware UpgradesWhy BEST KD303?BEST KD Series installation accessories deliver professional-grade precision with durable construction designed for repeated use in demanding commercial applications. This specialized drill jig ensures consistent, accurate installations that meet professional standards for 9K cylindrical lock mounting. Engineered for locksmith and contractor use where precise hole placement is critical for proper lock function and security.