I used these 3/16 by 1 1/4 to secure metal drip guards over my exposed windows, into 70 year old heavy texture stucco. So far I’ve used 30 screws, all are I strong as heck, but don’t use the included drill bit. Step down your bit by one size, the included drill bit will not allow the tapcon to grip. I tested my drilling into extra brick, even switched hammer drills to the same result. Very frustrating when drilling into your home. I read reviews to see a lot had the same issue.