Usage Tips:[Widely used]: 15 most commonly used sizes, suitable for all general-purpose notebook computers. Such as B. IBM HP Mac Mac Dell Lenovo SAMSUNG Sony Toshiba LG Gateway and so on. [BOX SIZE]: about 178 x 105 x 23 mm, it is very convenient for you to arrange the screws, it looks neat and orderly. [Screw material]: Alloy steel, laptop screw set has excellent anti-rust performance, can ensure long-term use. [Computer repair]: A set of different screws used for laptop repair, it is very convenient for you to repair the laptop. Category: Combination screws Head type: round head Groove type: cross Function mode: hand screw/screwdriver Thread specifications: M2 x 3 (small), M2 x 3 (large), M2 x 4, M2 x 6, M2 x 8, M2 x 10, M2.5 x 3, M2.5 x 4, M2, 5 x 5 , M2.5 x 6, M2.5 x 8, M2.5 x 10, M2.5 x 12, M3 x 3, M3 x 4 (30 pieces of each size) Thread tolerance: standard Surface treatment: black oxide Material:alloy steel colour:black Package Contents: 30 x M2x3 Screws(small) 30 x M2x3 Screws(large) 30 x M2x4 Screws 30 x M2x6 Screws 30 x M2x8 Screws 30 x M2x10 Screws 30 x M2.5x3 Screws 30 x M2.5x4 Screws 30 x M2.5x5 Screws 30 x M2.5x6 Screws 30 x M2.5x8 Screws 30 x M2.5x10 Screws 30 x M2.5x12 Screws 30 * M3x3 Screws(Head size 7mm) 30 x M3x4 Screws Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.