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shopped all the local stores trying to find a chuck attachment that met my needs. this chuck is great and so easy to remove and add and is solid.
The main drawbacks are: a)Time lost changing bits, b)Keeping the chuck key handy. I hope potential buyers find this information useful. The obvious drawback to hex-shank bits is that they will not fit securely in a drill bit sharpener and must be dressed manually (which requires skill, practice and a knowledge of bit dynamics) or replaced (costly & wasteful). Having used both keyed and keyless chucks for many years I can tell you from my experience that an old-fashion Jacob's (keyed) chuck is the most secure. A GOOD quality keyless chuck will do a descent job of gripping the bit and eliminates the need for a key (Makita makes one). My 3 star rating is not a reflection on the quality of the product but addresses the convenience enjoyed by using a keyless chuck. 1/4" hex-shank bits are great for rapid change and will not spin out in any chuck (and eliminate the need for a chuck in a tool (like an impact driver drill) equipped with a quick change collar.
The Makita was also a bit top-heavy to work well with the Yankees even it did keep the bits secure after using a faster drill to secure the bit.I still don't get the big deal with keyless chucks. I originally bought this with the intention of giving my Yankee-style spiral ratcheting screwdrivers a drilling option. It works okay with my original Yankee from '50s (it's a touch wobbly) but it works great with my modern Schroeder spiral ratcheting driver, which has much tighter, more stable action (Schroeder FYI, is a German precision parts company).Now it also gets used with my Milwaukee 12-volt sub-compact driver/drill so I can use higher quality drill bits with a wider variety of sizes which makes a world of difference and vastly expands the role of this amazing little power tool.The keyed chuck and light weight make it a lot more practical of an option than the heavy Makita 1/2" keyless version that relies on drilling at high speeds for a few seconds to lock the bit in. Too many of them don't work very well and I don't want to risk an expensive bit on a loose chuck.Anyway, Milwaukee couldn't have built a better adapter for my needs and it was well worth ~20 bucks. This made it hard to get the bits secure in the Makita with a relatively low-RPM driver, which struck me as kind of a dumb oversight on Makita's part.
Well made, solid, comes with a key so don't need to buy another one from Amazon. I bought it to convert my electric screwdriver to a drill for small bit sizes, works well.
just to let you know the chuck comes with a chuck key. i was pleased when i opened the box. it is not listed anywhere and Amazon tries to sell you one for $2.15. i almost bit but the shipping was going to be over $6 on a $2 item.
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