"Great for on fashion slotted screws which tend to have thicker shanks, but for modern screws the pilot holes are a bit too large. I used the largest one which is the only only that would centre in the standard 3" butt hinges I was using and the pilot hole was too big for standard number 4 pozidrive screws. They would be great for brass slotted screws though as the larger holes would be an advantage but who really uses those any more on regular work?"
"Please have products tested and iron out problems that can be easily solved with simple changes. This product fails because a clockwise spiralled spring is used instead of an anti-clockwise spiralled spring. The spring keeps catching on the gap in the circlip and jamming the 'plunger' around the drill-bit. Either change direction of the spring or use a shoulder without a circlip. Either will solve the problem anf make an excellent product."
"Screwfix need to get some quality bit sets in , the springs keep sticking and you cant find replacement drill bits at screwfix , you have to buy a HSS drill set to get the 3 you need as replacements,,,dont waste your money"