Placing a bench- mounted kitchen sink mixer tap:
Decide on the best position and drill a size hole recommended by the tap ware manufacturer. If drilling into stainless steel you will need an eighth of an inch (3.0 mm) pilot drill followed by a ½-inch (15 mm) drill bit for steel to allow enough of a hole to give the stainless steel chassis hole cutter access. Use it by tightening the bolt until it breaks through by cutting the stainless steel.
Remove tap body from box and install the hot and cold flexible hoses into the bottom. Next install the threaded bolt pin or pins into the bottom and place the washer. And positioning it over the top of the hole in the bench lower the first hose into the hole followed by a squeeze of the second flexible pipe into the hole. Then position the lever top so that it turns from where you want it to where you want it to go. Then go under the bench in the cupboard and place the rubber washer and the mounting plate and the holding nuts. And tighten well with a suitable tube spanner.
Next attach the hot flexi hose to the hot barrel nipple sticking out of the wall and tighten with an 8-inch (200 mm) spanner. Repeat for the cold and then make sure the trap is connected before turning the water on to test.