These bits are a very popular and size used by Jewelry Designers for drilling a good fresh hole in Beach Sea Glass for making Earrings, Pendents and Bracelets. They bigeminal layers of commercial enterprise diamond particles bonded to the tips which provides for longer drill life and are first-class for drilling completely through any thickness of Beach Sea Glass up to 1/2 fat. These Bits can be in any flooding speed Dremel-Type turning Tool or midget Precision Drill Press with a 3/32 collet or adaptable collet.