High carbon steel construction ensures hardness, while milled guaranteeing secure slot engagement for operational Perfect for workshop applications requiring connection in shafts, pulleys, and gears across automotive, manufacturing, and heavy machinery sectors Comprehensive Woodruff Set with 100pcs carbon steel pieces in sizes for mechanical applications Designed for mechanics, enthusiasts, and repair technicians maintaining industrial machinery, automotive transmissions, or agricultural equipment This Woodruff assortment combines durability with dimensional accuracy to equipment maintenance and reduce downtime in professional repair environments, Manufacturer: HENYGEN