Gyros11 PCS Mini Twist Drill Bit Set #50 to #60 w/Dome Storage Case, Carbon Steel Wire Gauge Micro Drill Bits for Jewelry, Plastic, & Soft Metal | Small Drill Bits for Pin Vise & Rotary Tool

I installed a big bore kit on my sons CRF-70 and this kit made it super easy to jet the bike perfectly.

Good quality bits. Excellent selection with storage container.

Just what I needed. Very Small. Worked well in my Dremel rotary tool. Did break one drilling metal which didn't surprise me. Goes through wood like butter.

The fit and finish of the twist drills themselves was good, and the dimensions were good enough for drilling a pilot jet out a few sizes, but the index itself (the plastic holder) was a nightmare. out of the box, a handful of the twist drills were out of their holes and loose in the index. there is a rubber band around the base of the bits that puts an unnerving amount of force on them to keep them in place. when i removed that rubber band and closed the lid of the index, the bits went EVERYWHERE the second i set down the index. it appears as if the plastic lid is designed to keep the bits from lifting out of their holes, but that is not the case. the holes are angled such that all of the bits can rocket out. and they do. this is probably one of the worst designed indexes i've ever seen. i ended up mummy wrapping the entire thing in tape in the hopes that i will at least not loose the tinier sizes when i need them. you would be better off laying the twist drills down on a piece of Nashua duct tape in order of size so they stick in place (poor man's drill index)

Will work well for what I need

Outside of the drill bits themselves, the most important part of this drill set is the case these tiny bits come in.At first glance, you might think the drill bit holder's clear cap has stepped accommodations to slip over the ends of the bits to hold them more securely in their correct base positions. You would be wrong. Only the two smallest bits have small dimples that capture the tips of the bits. The rest of the steps are just solid blanks offering little security in keeping the bits in proper sequence. I suspect at one time these steps actually functioned, but running production changes (the bits being made shorter ...as in cheaper) made the steps worthless . Treat the case carefully; always keep it upright and park it someplace where it's not going to get knocked about. The bits are shipped with a rubber band stretched around the bases of the bits, holding them in place to withstand the rigors of shipping and showing how little faith the manufacturer has in the ability of the case to retain the bits.I bought these bits as wire gauges to check carb jets so using them as drill bits will not be in the game plan. I suspect their durability will be sufficient for my purposes. I have no idea as to their accuracy; I would need to put a micrometer to them for that. For my use, the drill bits cover a wide range of jet sizes for the small engines i will be tuning.

I have used this type drill set for many years. My only problem is that the smallest drills break really easy. It is hard to find them if you do not have a hobby shop in your area.

Need s pimvise to use

I purchased these to use as Motorcycle carb jet cleaners. Work excellent for that purpose. Will purchase a pin vise to use with them shortly.Container keeps them together and organized. I used a piece of electrical tape to lock the cap to the base in the event that they get knocked over or off of a desk.

The 80 is in the 60 place and the rest follow in the wrong position so there almost impossible to use

The media could not be loaded.  I use them for cleaning the carberators on Lawnmowers open up hole to prevent up and down gas surges.!allowing more gas thru carberator!

Absolutely want I needed for making holes in turrets or machines gun barrels when building plastic models. Be very careful with the smaller bits as they are fragile.

They seam to be proper sizes so far for drilling out carburator jets. The fine ones break very easily its anoying their not flexidle at all and break if you so slighlty axidently bend them and then you have to get the broken part out of the jet. But they do go up in sizes as they should