Seco Prism Mounting Adapter Kit for CR and SVR Leveling Rods The Seco 91258 Prism Mounting Adapter Kit provides a simple, secure solution for attaching a standard survey prism to CR and SVR grade rods. Featuring a 5/8” x 11 thread with a 1/4" x 20 stainless steel tip , it ensures compatibility with common prisms and accessories while enabling quick conversion of flat or oval rods into a stable prism mounting point for layout and alignment tasks. Key Features • Mounts a standard survey prism to CR and SVR rods • 5/8 x 11 thread with 1/4 x 20 stainless steel tip • Compatible with flat and oval rod profiles • Durable, simple design for field use