20pcs Diamond Coated Cylinder Head Drill Bits Set

Diamond Twisted diamond drills are typically used for drilling pearls and enlarging/reaming holes in large variety of other materials. These drills provide faster drilling speeds, than most other type of diamond drills. And are frequently used together with diamond flat bottom cylinder diamond solid thin drills. Also very popular for drilling pearls.
APPLICATION: typically used to enlarge existing size holes. Also recommended for drilling pearls.
ceramic, tile & related materials
advanced ceramics
glass & quartz
optical materials
composites
natural & synthetic stone
semi-precious & precious stone
many other materials