Fasteners for Simpson Strong-Tie Powder-Actuated Tools. Manufactured with tight tolerances for superior performance. Includes 1" metal washer. Use in A36 and A572 Grade 50 structural steel (red strip load recommended). 0.157" shank diameter for greater compressive strength. WARNING! This product can expose you to chemicals including airborne silica which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov -