? Meets/exceeds: DIN912 ? Screw head style: socket cap, screw drive style: hex socket, known as internal hex drives, hex size: 4 mm ? Thread Size(Dia.): 5mm, Pitch : 0.8 mm; Head Diameter : 8.8mm/0.34"; Head Height : 5mm/0.20" ? M5 x 60mm means : Metric screws, Thread diameter size 5 mm, Thread length 60 mm [ Sizes ]----------[ Thread Length ] -------[ Total Length ] M5 x 60mm--------60mm/2.36"----------65mm/2.56" M5 x 65mm--------65mm/2.56"----------70mm/2.76" M5 x 70mm--------70mm/2.76"----------75mm/2.95" M5 x 75mm--------75mm/2.95"----------80mm/3.15" M5 x 80mm--------80mm/3.15"----------85mm/3.35" Package Contains: M5 x 60mm------5 Pcs M5 x 65mm------5 Pcs M5 x 70mm------5 Pcs M5 x 75mm------5 Pcs M5 x 80mm------5 Pcs Hex Key ---------1 Pcs Total: 26 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 Socket Cap Head: Socket Cap Head , also known as Allen head , have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key