M6 thread, 69mm overall length. They have a T15 Torx recess in the machine screw end to aid tightening them. The 6mm woodscrew thread is 28mm long and the M6 machine screw thread is 31.5mm long. As well as furniture/joinery uses, this size is also suitable for repairing/restoring various banjos and for use with co-ordinator rods.
