These are Du-Bro 4-40 Threaded Rods 48" long FEATURES: Steel construction Threaded on one end INCLUDES:48" threaded rods REQUIRES: Coupler and/or Clevis. Can use (but not limited to) the following: GPMQ3832 Threaded solder coupler GPMQ3794 Threaded steel clevis GPMQ3814 Solder clevis SPECS: Length: 48" (122cm) Thread Length: .75" (19mm) Diameter: .093" (2.4mm)