Specifications include, but are not limited to: Group 1 Rubber Cutting Edge & Hardware 6.1.1. Rubber cutting edges are to be made of a wedge shaped piece of solid industrial strength rubber, it must have 5-1/2” of usable rubber; with a universal channel mount system that allows for hardware to be moved along the track to desired bolt pattern specification. The lengths are listed in the table below: Item No. Description of Product 1 36" Rubber Edge 2 40" Rubber Edge 3 48" Rubber Edge 4 60" Rubber Edge 6.2 Group 2 Carbon Alloy Cutting Edge 6.2.1. Bolt-on cutting edge material must be Black Cat Blade, BCB1084, High Carbon Alloy Abrasion Resistant Bar, or offered in an equivalent brand that meets the material hardness and composition requirements Including Target Hardness Bolt on Construction Blades 250 to 320 Brinell (25 to 34 HRC) Element Spec (in weight percentage) Carbon ( C ) 0.84 Manganese (Mn) 0.70 Sulphur (S) 0.05 maximum Phosphorous (P) 0.04 maximum Silicon (Si) 0.25 Iron (Fe) Remainder Total 100%