This Round Ended Key Stock Assortment comes with a plastic storage box for easy carrying and organization, allowing you to sort and access the feather keys conveniently. This Round Ended Feather Key Set features fine craftsmanship, providing a smooth and precise surface with no burrs, ensuring safe handling and protecting your fingers during use. This key stock is widely used in everyday applications. It is primarily used to secure equipment that requires frequent disassembly, fitting into a matching keyway to transmit torque between shafts and hubs or bushings. Available in multiple sizes: 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, and 30mm, meeting various application needs. The keys are rust-resistant, wear-resistant, and offer high expansion capability. Color: Black Material: Stainless Steel Sizes: 3mm, 4mm, 5mm, 6mm Package Contents: 1 x Box of Round Ended Feather Keys (includes 140 pcs) The package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1-3 cm.