Masonry Drill Bit - 4 Hole Base


Old 04-10-19, 08:56 AM
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Question Masonry Drill Bit - 4 Hole Base

I've been looking at some options for masonry drill bits and I am seeing that several of the higher end models have a base with 4 indentations on it. A picture of one of them is below.

I'm a little confused about why these have this shape. My hammer drill is a Ryobi cordless that has the standard 3-prong keyless chuck. How would this thing properly seat itself in my drill?

Also, if anyone has brand recommendations for drilling into a concrete patio, I'd gladly take them. :-)
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Last edited by ray2047; 04-10-19 at 09:22 AM. Reason: Enlarge, crop, and rotate image
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Old 04-10-19, 09:21 AM
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Thatís an SDS bit, used in an SDS chuck, more durable grip for masonry work, but they donít work very well in a 3 jaw chuck. For infrequent work your 3 jaw will work, but youíll want bits with straight shanks.
Old 04-10-19, 01:06 PM
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Cool, thanks for the info!
Old 04-10-19, 02:53 PM
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If you are drilling sizable holes (larger then 1/4") I would recommend going with an SDS hammer drill. SDS will drill much faster than a screamer hammer drill like your Ryobi. You can likely rent one if needed.
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