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What is special shaped drill or special drill?
07.30.2021 | diydigitalart | FAQ

Usually, "normal drill" are round shape or square shape, and they made of resin,acylic.
Contact to "normal drill","special drill" usually looks like crystal glass. People also call them AB drill,rhinestone,crystal drill. 

"Special shaped drill" means they not normal round or square drill ,they could include many shapes be designed according to the picture.