Check the listing for details. Notch 1/2" Rigging Block. Condition: New. Listed at 159.99 USD. The Notch 1/2" Rigging Block is a small sized lightweight arborist block accepts working lines up to 1/2” (13mm) diameter. Features 20 kN WLL / 100 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 captive screw pin lock High wall, full diameter, improved anchor sling protection Wide, concave upper sheave accepts 5/8” anchor slings Flared side-plates reduce twisting in complex rigging scenarios WORKING LOAD LIMIT: (WLL) 20 kN (4,496 lbs.) MBS: 100 kN (22,480 lbs.) MAX WORKING LINE DIAMETER: 1/2 in (13mm) MAX SLING DIAMETER: 5/8 in (16mm) UPPER SHEAVE DIAMETER: .75 in (19mm) LOWER SHEAVE DIAMETER: 1.5 in (38mm) HEIGHT: 4.7 in (118mm) WIDTH: 2.7 in (68mm) WEIGHT: 1 lb. (.45kg) SIDEPLATE MATERIAL: Aluminum SHEAVE MATERIAL: Aluminum AXLE MATERIAL: Stainless Steel