White plastic inter screws. One end of the cap is fitted with a threaded bolt and the other cap has an internal thread allowing the two halves to screw together. Both caps have slots in the head for adjustment with a screwdriver. When fully tightened, the distance between the two heads is 26mm. These screws are most commomly used for connecting kitchen cabinets, suitable for use with 15-17mm board.
Bright zinc plated fully threaded coach bolt, supplied complete with hexagon nut. Bolt has a 10mm thread and is 130mm in length. Coach bolts have a plain domed head which cannot be tightened with a screwdriver and a square section underneath the head which locates into a square hole and prevents the bolt from shaking loose.