This is the must have rigging and impact block for tree care. The Notch Rigging Block accepts up to a 3/4 in. rigging line and features rounded edges making it very rope friendly. The spring action lock makes for a secure connection between the side plates. 30 kN WLL / 150 kN MBS. Hot forged aluminum side plates with rope friendly rounded cheeks. Precision CNC machined aluminum sheaves with wide bend radii. Low profile, secure, easy-to-open two stage captive spring pin lock with a high wall, a full diameter and improved anchor sling protection. The wide concave upper sheave accepts 1.125 in. anchor slings while flared sideplates reduce twisting in complex rigging scenarios.