The Original™ Curved Jaw Locking Plier, Jaw Opens to 1 7 8 in, 10 in Long ORS NASCO the same material used in the same material used in our welding helmets Includes crown plus hard hat attachment 023 in Bristle Material Carbon Steel Catalog MPI Catalog Construction Catalog NO Country of Origin US Dia Self energizing lower jaw provides 3X more gripping power than traditional locking pliers with no slipping or stripping Provides maximum torque without requiring heavy input pressure jaw mechanism naturally grips tighter as more torque is applied to the tool Classic trigger release provides maximum locking force Curved jaw puts tremendous pressure on four points of any style nut or bolt head