Wide Compatibility with Toro Series - Perfect fit for Toro TimeCutter, Titan, Quest models: Titan 34/42/50/60, MX/SW/SS/Z/ZS/ZX series; Quest E-Series 34/42/50/54, S-Series 34/42/50/54; MyRide 42/50/54. Also fits models 74370, 74822, 74625, 74793, 74843, 725058056, etc. (Full model list in 2nd point). Compatible with Exmark, Hayter & More - Fit for Exmark Pioneer E-Series 48/52, S-Series 44/48; Hayter Wheel Horse RZT420H, XLS420T & Zero Turn Lawn 74840-74843. Additional compatible models: 74638, 74723, 74871, 74390, 74661, 74785, 74830, 74363, 74603, 74732, 74815, 74912. Premium Carbon Steel Material - Made of AISI 1045 high-quality carbon steel, surface with blue-white zinc plating. Features high strength and rust resistance, resisting outdoor moisture, lawn sap erosion and UV, durable for long-term outdoor use. Reliable Fastening & Positioning - Shoulder bolt design realizes dual functions of positioning and fastening, ideal for mower blade holders, frame connectors and transmission parts. Prevents parts from loosening due to vibration, ensuring stable operation. Easy Installation & Safe Use - Tool-friendly installation, match with corresponding washers (not included). Tighten according to equipment manual torque to avoid thread damage. Withstands blade rotation impact, no deformation or slipping. Outdoor Durability & Cost-Saving - Excellent wear resistance, not easy to corrode or break. Reduces frequent replacement costs, suitable for home and small commercial lawn maintenance, ensuring mower safety and efficiency.