This equipment has received criticism in Amazon reviews but is more than adequate for the work it was designed for, light duty clamping. It fits the base plate of the Bosch PDB 40 Bench drill perfectly though you need to source suitable "T" nuts and 30 mm M8 set screws to fix it down. See my photo below for more information. I bought stainless steel bolts to prevent corrosion with all the different alloys in contact.
OK for holding light and more delicate workpieces
Not strong enough for large and heavy steelwork.