All snow blades have trip springs for controlled break over in snow and lock for light grading of loose dirt or gravel. All have 3/8" x 6" reversible hard steel cutting edges and height adjustable skid shoes (6" x 1/2" thick) that rotate for long wear. Manual angle adjustment is standard on 5-ft., 6-ft., & 7.5-ft. models (optional hydraulic angle kits available). 9-ft. blades have hydraulic angle adjustment and cross-over relief valve as standard equipment.