The speed and ease of use that these connectors bring makes them very cost effective. For worktops of 25mm and over, the standard 170mm Zipbolt connector would be the first choice. With a mechanism 20mm deep requiring a 35mm housing bore they are compatible with most worktop jigs. A 5mm hex bit will be required for tensioning these connectors.
If the worktop joint is adjacent to a sink or hob then the shorter 85mm connector may be the best option.
For jointing materials from 16mm to 25mm, use the Mini Benchtop connector (6 x 100mm) these are great for standard 19mm boards. The mechanism is only 12.5mm deep and requires a 25mm diameter housing. It requires a 4mm hex bit for tensioning.