hello. first off, i build decks for a living. i just finished an 1100 sq.ft. deck re-skin this past week. the previous deck was a composite deck and the joists were 12" on center. the new decking i installed was 13/16" ipe. also know as "iron wood" all the holes have to be counter sunk and drilled through the deck board. this smart bit is an indispensable tool in my arsenal. i installed roughly 5100+/- stainless steel screws on this deck.i have 4 older smart bits and ordered a new one and a pack of 5 extra bits for this project. the deck was 11 years old and as you can imagine the 2 x 12" joists were extremely dry. this countersink tool is made for only drilling and counter sinking vertical holes. i use a separate countersink bit for angled holes.in my experience using this bit, it cannot be forced into the wood. at least not in ipe. occasionally i would have to drill in a1/2" and then pull the bit out to clean and then finish drilling the hole and counter sink. ipe is extremely hard and dulls sharp blades very quickly. after several hundred holes the counter sunk holes were ragged. not an issue as the whole deck is going to be sanded and then stained. i will tell you that i broke all 7 bits that i had for this project. on occasion i would hit a knot or the remains of a broken deck screw . and user error i will admit.haha! i also use this bit on cedar decks on the board edges to prevent splitting. i will continue to buy and use this product as long as i am building decks. i hope this helps out on your next project!