Question 1

Some reviewers state “round shank”. Description states hex. Which is it?

Accepted Answer

We produced round shank before April,2021, and imroved to Hex shank after that. 
That means All the order after April,2021 will be Hex shank.

Question 2

length of bits?

Accepted Answer

3 5/8”

Question 3

What is the total length of the bits?

Accepted Answer

3.5 inches with a 5/16 inch shank

Question 4

Would these be appropriate to use in a hand drill on acrylic?

Accepted Answer

Sure, no problem - I've used Forstner bits in hand drills multiple times. Trick to using anything (hole saw, Forstner bit, or a simple drill) to cut a hole in acrylic or Lexan is to use heavy duty clear plastic tape on the panel on both sides where the hole will be drilled (I always do this when cutting acrylic on my table saw too). The tape prevents slight wobbles of a hand drill or while using the saw  from creating micro cracks around the cutting edge - tape will prevent major cracks as well - it's a must if you're using a jigsaw to cut acrylic. I use Scotch Heavy Duty Packaging Tape, $15 for 6 rolls here on Amazon. Just make sure you run the tape long, past the edges of the work piece (especially if you're ripping a big piece of acrylic on a table saw), and fold over the ends so the top and bottom pieces of tape don't stick together - makes removing the tape when you're done drilling/cutting much easier. If you're cutting holes near the edges you can just wrap a single piece of tape around the edge of the panel, but again fold over the ends to they don't stick to the panel. If you don't have folded ends of tape it can make removing it a royal PITA, need to use a knife or razor blade scraper to cut and lift the tape to pull it off - tape inevitably splits and you're likely to scratch the acrylic - you end up having to pull off small sections at a time, so instead of removing the entire piece of tape in one quick motion you'll spend 5-10 minutes using a scraper to remove all it - time wasted depends on how much tape you have to remove - it sticks to acrylic REALLY well. If it's a brand new piece of crystal clear acrylic it's easy to leave slivers of tape behind because it blends in so well it's hard to see the slivers, and that might cause a problem later on if you're gluing two pieces together, glue won't stick to the tape, making the joint weak and prone to failure. I use the same tape trick when cutting luan or plywood panels - the tape prevents splintering when cross-cutting the panel or drilling holes thru it - but if the surface is rough plastic tape won't stick well, so I use cheap duct tape instead.

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INTOO Hex Shank Forstner Bit Set 8pcs Multi Sided Shank Wood Drill bit Set

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