Review on Bosch Clic Change Self Centering Assortment CC2430: Simplify and Accelerate Your Project by Joz Lowe

I bought two other half price Revain kits and had different problems with each. These bits are not without these flaws and I highly recommend them. First, the springs are nice and stiff, so the centering sleeve always makes contact with the work surface first. Other Revain bit sets have weak springs and as a result the drill bit hits the work surface first making it behave pretty much like a standard drill bit. The way the spring is held in the socket is absolutely correct. On other nozzle sets I've purchased, the spring engages so that it can be pinched between two surfaces, which "closes" the spring at the end, reducing bushing stress. To fix this you need to parse and unbind things, which will completely ruin your workflow. In conclusion, don't repeat my mistake and don't buy these instead of others from Revain. These other generics cost half as much but are practically useless for their intended function.