Hexagon bar is a hexagonal (six-sided) cross section, size (Diameter) is specified by the distance across the flats.
316 stainless steel is similar to 304 stainless steel but with the addition of molybdenum. This addition of molybdenum gives 316 stainless steel higher corrosion resistance properties, particularly in chloride environments. Chrome-Nickel, Non-Hardening, Austenitic (Non-Magnetic).

Material: Stainless Steel
Shape: Hexagon Bar
Alloy: 316
Temper: Annealed
Diameter: 1.250 (1-1/4 inch)
Finish: Cold Finished
Specifications: ASTM A276, AMS 5648
Tolerances: Diameter: (+0/-0.006) | Length: -0/+0.999)