Glass bits have a spade-shaped carbide point, used to drill holes in materials of glass, ceramics,etc. They generate high temperatures and have a very short life. Holes are generally drilled at low speed with a succession of increasing bit sizes. Diamond drill bits can also be used to cut holes in glass, and last much longer.
It is an alloy triangular bit mounted on the ordinary Electric Hand Drill, which has high hardness, sharp blade and good precision, and is specially used for opening holes in ceramic tiles. But the drill wears too much into concrete to be used on concrete.
Ceramic Tile Bit,Ceramic Drill Bit,Drilling Through Tile,Ceramic Tile Drill Bit Behappy Crafts (suzhou)Co.,Ltd , https://www.craftsbehappy.com
TYPE C Si Mn P S Ni Cr Mo Cu Other
201 0.15 1 5.5-7.5 0.06 0.03 3.5-5.5 16-18 -  N<0.25
130M/202 0.15 1 7.5-10 0.06 0.03 4.0-6.0 17-19 -  N<0.25
301 0.15 1 2 0.045 0.03 6.0-8.0 16-18 -
302 0.15 1 2 0.045 0.03 8.0-10 17-19 -
302HQ/XM7 0.08 1 2 0.045 0.03 8.5-10.5 17-19 - 3.0-4.0
303 0.15 1 2 0.2 >0.15 8.0-10 17-19 >0.6
303CU 0.08 1 3 0.2 >0.15 8.0-10 17-19 <0.6 1.5-3.5
304 0.08 1 2 0.045 0.03 8.0-10 18-20
304H 0.08 1 2 0.045 0.03 8.0-10 17-19
304HC 0.08 1 2 0.045 0.03 8.0-10 17-19  2.0-3.0
304L 0.03 1 2 0.045 0.03 9.0-13 18-20  2.5-4.0
304M 0.06 1 2 0.045 0.03 8.9-10 18-20
304N1 0.08 1 2.5 0.045 0.03 7.0-10.5 18-20  N0.1-0.25
305 0.12 1 2 0.045 0.03 10.5-13 17-19
305J1 0.08 1 2 0.045 0.03 11-13.5 16.5-19
309S 0.08 1 2 0.045 0.03 12-15 22-24
310S 0.08 1.5 2 0.045 0.03 19-22 24-26
314 0.25 1.5-3 2 0.04 0.03 19-22 23-26
316 0.08 1 2 0.045 0.03 10-14 16-18 2.0-3.0
316CU 0.03 1 2 0.045 0.03 10-14 16-18 2.0-3.0 2.0-3.0
316L 0.03 1 2 0.045 0.03 12-15 16-18 2.0-3.0
321 0.08 1 2 0.045 0.03 9-13 17-19  Ti<5*c%
410 0.015 1 1 0.04 0.03 - 11.5-13.5
416 0.15 1.25 1.25 0.06 >0.15 - 12-14
420 0.26-0.4 1 1 0.04 0.03 - 12-14
410L 0.03 1 1 0.04 0.03 - 11.5-13.5
430 0.12 0.75 1 0.04 0.03 - 16-18
430F 0.12 1 1.25 0.06 >0.15 - 16-18
631J1 0.09 1 1 0.04 0.03 6.5-8.5 16-18
Composition of various stainless steel materials
Grade Chemical composition