This product is a complete disaster. Despite the affordable price I ended up regretting buying it. The screws are simply too coarse and they strip out very easily. Even though they were marketed as drywall screws, they wouldn't even go through the drywall without cracking it first. The only pro is that THEY were delivered on time. But the cons just keep piling up: poor quality, subpar performance, and overall disappointment. I would recommend avoiding these screws and investing in a better brand for your industrial and scientific needs..