BOSCH3-Jaw Keyless Chuck with SDS-Plus Shank, 1/2-Inch HA3JAW

This chuck is easy to tighten and provides an audible and tactile indication that it is tightened around the drill bit! Seems to be built sturdily and will stand up to heavy use.

Excellent chuck. Very strong and built with high quality materials. Very strong jaws. Has a ratcheting clutch like action and sound to it when hand tightening the chuck. Easy to loosen as well. Never comes loose when you are using it. Stays tight on your bit during all actions. When I got this unit, I took off the SDS adapter shaft and put it on a regular keyed chuck. I've heard that using a keyed chuck with a hammer drill, is better overall, rather than using a keyless chuck with a hammerdrill. I'm sure that it would have worked just fine with a hammerdrill though. So I put just the keyless chuck on my regular 1/2" drill, and I used the SDS adapter shaft on a keyed chuck for use with my hammerdrill. Easy to mount this chuck, and easy to use. In my opinion, this is the best keyless chuck I have ever used, and I have used many many others of different brands and sizes. Can't go wrong with the quality and design of this chuck, and having the SDS adapter shaft is a great tool to have on hand as well.

Worked great with my Bosch Bull Dog Hammer Drill.

This is probably the best quality SDS Plus keyless chuck on Amazon. That being said it does the job for me but I noticed some runnout at the end of my drill bit when I ran my cordless hammer drill. It has never effected my work because I wouldn't be doing precision work with a cordless drill anyway. Also, as noted in other reviews, when the chuck is in the drill, it has the ability to move about a quarter inch axially in either direction. This does not effect any or my drilling operations because you will always be pressing into the workpiece and so you really don't notice it when drilling.Pros:-overall quality-keyless design-decent priceCons:-the chuck has some runnout to it. not intended for precise applications.-it can oscilate back and forth in the hammer drill (probably not an issue to most people)

The best

This is just what I needed to be able to use my smooth shank drill bits in my SDS Plus drill. This adapter is very handy to keep around the workshop. This tool is not easily found in local hardware and tool stores. Better to buy it here and have it on hand when you need it instead of going out to hunt it down when you need it.

I bought this a while and finally got around to using it. I was very disappointed that it broke on the very first use, since it was sold by Bosch.

This product is great.Two things:(1) The SDS Plus system usually gives about 1/2 inch of movement for the rotary hammer to bounce up and down to impact the rear of a concrete drill bit. That means that this adapter, which plugs into an SDS Plus socket, also has about 1/2 inch of movement before your pressing or pulling engages it. I doubt anyone is using this for tight spaces or for finessing specific drill depths, but if you are, you might run into some difficulties.(2) There is a locking mechanism on this which isn't really described. In short, it will tighten on the bit until it can tighten no more. If you spin it slightly further, it will lock the bit with a firm amount of pressure. In order to remove the lock, you need to first turn it slightly in the direction of tightening it and then reverse the spin to loosening the grip. You will hear a click then and it is unlocked and you can continue loosening it.There was nothing in the directions about this and it may be a common thing, but as a DIY person who is replacing a very old hammer drill, this was news to me and it would have been nice to figure it out someway other than by trial an error.