The HNT Gordon is designed to hold any piece of wood flat on the top of your bench. It is retrofitable to any bench (in any position on the top) without interfering with the integrity of the top.
The knob is 32mm (1-1/4") in diameter, knurled for grip and allows for quick movement with plenty of grip to tighten the vise. It is supplied with one solid brass dog that is 6 mm (1/4") high for low profile work. Other size dogs will be available also or you can make them to suit using 1/2" brass rod.
It is simple to install and it comes with an installation guide. You will need to make a wooden cover plate to go over the top of the vice and this is planed level with the top. If your bench top is thin, this is no problem as you simply make up some wooden packers and glue them in under where the vice is to be fitted.
100mm Tail Vice:The vise body is a hefty 32mm x 35mm x 280mm long with a 5/8" 6 tpi ACME thread for a quick moving action. It gives you just over 100mm (3.94") travel so you would need to space your bench dog holes at 100mm or less apart. Weighs 1.3 kg.
150mm Tail Vice: The vise body is a hefty 32mm x 35mm x 370mm long with a 5/8" 6 tpi ACME thread for a quick moving action. It gives you just over 150mm (5.9") travel so you would need to space your bench dog holes at 150mm or less apart. Weighs 1.6kg.
Here is a video showing the tail vise being installed: