Description of ๐จ DEWALT DW5470 5 Piece Carbide Hammer: Max Performance for Superior Results
Strong core: SDS max bits have tapered core for bit strength and maximum durability, especially when drilling deep holes. Aggressive material removal: Two stage flute design with variable helix pattern of DEWALT SDS hammer drill bits allows for efficient debris removal. Clean, round holes: Two sharp cutting edges for true holes. Wear mark indicator: For accurate diameter of holes. ROCK CARBIDE tip maximizes carbide surface contact for longer bit life. Four flute design cleans debris out for fast, efficient drilling. Rock carbide tips for longer bit life. Included with this set: 3/16-x-6-1/2-, 1/4-x-4-, 1/4-x-6-, 3/8-x-6-, and 1/2-x-6-inch bits. Bit lengths include 3/16-by-6-1/2 inch, 1/4-by-4 inch, 1/4-by-6 inch, 3/8-by-6 inch, and 1/2-by-6 inch (diameter x length).
Very disappointed with the quality of these bits. I received them on Saturday and proceeded to drill holes to attach the bike rack to the concrete floor. The first 7 holes are drilled like a champion. On the 8th hole - it broke in the hole - there is no way to pull it out. That's a 5'2" woman, so I'm pretty sure I didn't rape the puncher and it shouldn't have broken. By the way, I'm suspicious because of the age of the drills - note the rust on the drills. and the photo was taken on Sunday - 1โฆ
My days of buying cheap drills are over. I'm building a deck where I need to attach planks to a concrete foundation. To be honest I was scared of this part because my previous masonry experience was extremely disappointing. The process just hit my arms and shoulders, and I ended up just burning my cheap beats. These beats are different. I wouldn't say they cut through concrete like butter. But once installed, they drill pretty well. I still have a lot to do, but I think this is perhaps theโฆ
Pros
Four-edged design removes debris for fast, efficient drilling.
So I bought these bits after trying a Chinese bit I bought from Lowes. The Chinese part, as I expected, turned out to be frankly rubbish. This is the real deal with an excellent guarantee from DeWalt. Unfortunately, I first put them in a cheap Skil impact drill (that's just a name now, not the old Skil quality) and they kept twisting out of the drill chuck. Returned the drill, tried my son-in-law's American made drill. No problem. So don't skimp on a drill bit or anything when trying to drillโฆ
Pros
Carbide tip maximizes carbide contact with the surface for longer bit life.