The Hertel Indexable Threading Toolholder is a precision machining tool engineered for internal right-hand threading applications. Featuring a substantial 1" shank diameter and accommodating workpieces with a minimum bore diameter of 1.16", this professional-grade toolholder provides exceptional versatility for threading operations. With an impressive 8" overall length, it offers excellent reach for accessing deep bores while maintaining the stability needed for precise threading. This HSI series toolholder (HSIR) is compatible with 22IR inserts with a 1/2" inscribed circle, allowing for versatile threading operations across various materials. The indexable design enables quick insert replacement when cutting edges wear down, minimizing downtime in demanding production environments. Part #H08700312 from Hertel's HSIR series is constructed with industrial-grade materials to withstand the rigors of professional machining operations while consistently delivering accurate threading results. This toolholder represents the quality and reliability that machinists expect from the trusted Hertel brand.