Drive 1" (25.4mm) to 1-5/8" (41.27) Posts, T-Posts Used with Rhino GPD-40 Fence Pro & GPD-45 Multi-Pro Series Pro Post Drivers Rhino O.E.M. Parts Made in USA Chuck-Lok sleeves fit inside the chuck to allow you to drive a wider range of post sizes. This 1-3/4" adapter fits the Rhino GPD-40 Fence Pro & GPD-45 Multi Pro Post Driver Series.