I've been using Hilti 409492 dropin anchors for a while. They're about $1 each ($50 for a box of 50). There are a number of other brands including Simpson, Wej It and Powers. Simpson is a pretty well known brand with quality products. What surprised me is a box of 100 is about $16 SHIPPED from Amazon. So sixteen cents each vs. a dollar each for the Hilti. Figured I'd test them side by side to see if the Hilti performed better or something to justify the extra cost...