- Assorted kit of 205 Woodruff semicircular keys in 12 metric sizes: 3 mm, 4 mm, 5 mm, and 6 mm. - Made of high-quality carbon steel, ensuring strength and long service life. - Includes sizes: 3 x 10 x 3.7 mm, 3 x 13 x 5 mm, 3 x 16 x 6.5 mm, 3 x 19 x 7.5 mm, 4 x 13 x 5 mm, 4 x 16 x 6.5 mm, 4 x 19 x 7.5 mm, 5 x 16 x 6.5 mm, 5 x 19 x 7.5 mm, 5 x 22 x 9 mm, 6 x 22 x 9 mm, 6 x 28 x 11 mm. - Perfect for applications in pulleys, drive shafts, motors, and industrial machinery. - Smooth surface and precise finish for a secure and efficient fit. - All pieces organized in a practical and durable storage box. - Facilitate maintenance and repair of tools, lawnmowers, and mechanical equipment. - Complete solution for professionals and DIY or mechanical enthusiasts. - Save time and avoid unnecessary trips to the hardware store.