Laptop Screw Set 450/650/720PCS Flat Head Machine $ 8.52 Category: Machine Screw Head type: countersunk head Groove type: cross Screw diameter: 1.4 (mm) Product specifications: 450PCS/box, 650PCS/box, 720PCS/box Mode of action: hand twist Thread specification: standard Thread tolerance: 4h Surface treatment: black plating Material grade: Carbon steel 4.8 grade Product grade A grade Screw length 16 (mm)