The Notch 3/4″ Rigging Spring Block is a medium arborist block designed for rigging lines up to 3/4 inch (19 mm). Hot forged aluminum side plates, CNC machined sheaves, and wide bend radii provide smooth rope handling, while the two stage captive spring pin allows quick opening and secure closure. The block has a 30 kN working load limit and 150 kN minimum breaking strength, with a wide upper sheave that accepts anchor slings up to 1 1/8 inches.