A set of swivel blocks specifically designed for building a “Personal Mechanical advantage (AKA “Set of Fours”).(not included)

Ingenious design is super strong and allows ratchet Prusiks to be detached with a push button pin. (not included)

Each block has a built in swivel, and accepts 8-9mm rescue cord. Handy for those that find pulley systems confusing.

Comes with one pin, one becket cover and instructions.

Strength in position of function: 36kN

Sheave Diameter: 1.1 in.
Max. Rope Diameter: 5/16″ (8-9 mm)
MBS. 8,093 lbf. (36 kN)
Height: 4.1 in.
Width: 2 in
Weight (pair): 15 oz.