Laser-welded drill bit 25, Laser-welded drill bit 28, Laser-welded drill bit 32, Laser-welded drill bit 36, Laser-welded drill bit 38, Laser-welded drill bit 42, Laser-welded drill bit 52, Laser-welded drill bit 57, Laser-welded drill bit 62, Laser-welded drill bit 72, Laser-welded drill bit 77, Laser-welded drill bit 82, Laser-welded drill bit 92, Laser-welded drill bit 102, Laser-welded drill bit 107, Laser-welded drill bit 112, Laser-welded drill bit 122, Laser-welded drill bit 127, Laser-welded drill bit 132, Laser-welded drill bit 142, Laser-welded drill bit 152, Laser-welded drill bit 162, Laser-welded drill bit 172, Laser-welded drill bit 182, Laser-welded drill bit 200, Laser-welded drill bit 67