①. Made of stainless steel, durable and practical. ②. Work-hardened surface provides high-strength, load-bearing threads, which will not slip out easily. ③. Mainly used for precision machinery, bearing, electronic products, lock, lights repair etc. ④. 10 sizes and 200 pieces headless hexagon screws, meeting all your needs in the load of fastening. ⑤. Comes with head sockets case, storing 10 sizes of commonly-used screws. ⑥. Specification: ⑦. Material: Stainless Steel 304 ⑧. Overall Size: ⑨. Hexagon Sockets M3 x 0.5 3mm 20pcs ⑩. Hexagon Sockets M3 x 0.5 4mm 20pcs ⑪. Hexagon Sockets M3 x 0.5 6mm 20pcs ⑫. Hexagon Sockets M4 x 0.7 4mm 20pcs ⑬. Hexagon Sockets M4 x 0.7 6mm 20pcs ⑭. Hexagon Sockets M5 x 0.8 5mm 20pcs ⑮. Hexagon Sockets M5 x 0.8 8mm 20pcs ⑯. Hexagon Sockets M6 x 1 6mm 20pcs ⑰. Hexagon Sockets M6 x 1 10mm 20pcs ⑱. Hexagon Sockets M8 x 1.25 8mm 20pcs ⑲. Package Includes: ⑳. 1 Set Screws Assortment Kit (200pcs) ㉑. Note: ㉒. Since the size above is measured by hand, the size of the actual item you received could be slightly different from the size above.