Maintenance Pak kits are a collection of fasteners for practical use around the home or workplace. A machine screw is a fastening screw with a machine-cut thread throughout the length of its shank. Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten various components together in machines, tools, etc. Fasten with a screwdriver to reduce risk of over-tightening and protect the screw and fastened material. If nuts are needed, use with nuts of the same finish and threading for proper fit. The length of a machine screw is measured from under the head to the point of the screw. Machine Screw sizes and quantities included in kit. M3-0.50 x 6mm 25 EA, M3-0.50 x 10mm 20 EA, M4-0.70 x 6mm 20 EA, M4-0.70 x 12mm 20 EA, M4-0.70 x 20mm 18 EA, M4-0.70 x 25mm 13 EA, M4-0.70 x 30mm 10 EA, M4-0.70 x 40mm 10 EA, M5-0.80 x 10mm. 12 EA, M5-0.80 x 16mm. 10 EA, M5-0.80 x 20mm 9 EA, M5-0.80 x 25mm 8 EA, M5-0.80 x 30mm 7 EA, M6-1.00 x 12mm 8 EA, M6-1.00 x 16mm 7 EA, M6-1.00 x 20mm 7 EA, M6-1.00 x 25mm 5 EA, M6-1.00 x 30mm 5 EA.