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✔Meets/exceeds: ISO7380 ✔Screws Head Style: Button Head ; Screw Drive Style: Hex Socket, Known as Internal Hex Drives, Hex Size: 3.0 mm ✔Head Diameter : 9.3mm; Head Height : 2.6mm; Thread Pitch : 0.8 mm ✔Easy to store : these screws and hex key wrench come in an easy-use separated girds storage box ✔M5 x 20mm means: Metric screws, Thread diameter size 5 mm, Thread length 20 mm [ Sizes ]---------[ Thread Length ]-------[ Total Length ] M5 x 20mm-----------20mm/0.79"------------22.6mm/0.89" M5 x 25mm-----------25mm/0.98"------------27.6mm/1.09" M5 x 30mm-----------30mm/1.18"------------32.6mm/1.28" M5 x 35mm-----------35mm/1.38"------------37.6mm/1.48" M5 x 40mm-----------40mm/1.57"------------42.6mm/1.68" Package Contains: M5 x 20mm------10 Pcs M5 x 25mm------10 Pcs M5 x 30mm------10 Pcs M5 x 35mm------10 Pcs M5 x 40mm------10 Pcs Hex Key ---------1 Pcs Total: 51 Pcs About Hex Socket Drives Hex Socket drives, also known as internal hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench About Button Head Button head screws are similar to standard pan head screws, but have a curved top