Really good Quality we’ll impressed

They are hex shank for an impact driver, but that does not mean they are "impact rated".All of the smaller sizes are two-piece, a drill bit brazed into a hex shank. If you abuse these, they will break at the connection between the two pieces. Do not listen to these other reviews saying they break. These people are ABUSING these bits, waggling them around at max speed in an impact, probably drilling deep full depth holes, hammering them with the impact like a twisted chisel.The impact hammer should never engage with these if you're using them right. If the impact is actually impacting, rather than just spinning like a drill, SLOW DOWN.These are for CONVENIENCE & LIGHTENING YOUR PACK, so you can carry only an impact instead of impact + drill, they are not for demolition, high-precision, or mashing the trigger like a gorilla with speed cranked to max on your impact. The larger single piece ones will probably withstand that kind of abuse, but the two piece ones will eventually break. Use lower speeds & take it easy on the two-piece bits and they hold up just fine in wood & drywall. DO NOT USE THEM ON METAL. Thin aluminum is probably fine, but steel will absolutely destroy these. They are not for this. Go buy a set of m35 or m42 molybdenum cobalt HSS bits for steel & keep them lubricated.I've been using these for >90% of my low precision wood/drywall drilling handyman work for several months. I estimate around 500 holes drilled with the set, almost entirely with the mid-size two piece ones at depths less than 2". NO FAILURES, work just as well as day one.This is a very solid set at a great price. Just use them how they're intended. Stay within their limits.

Buenas brocas, las uso con madera y cemento y funcionan bien.

六角のチャック様に、購入しました。空回りは、無さそうですね。

Received items in good working condition.