All options：
| Desc | Options |
| Material | ▢ M3 ▢ M42 |
| Teeth | ▢ with ground teeth ▢ without ground teeth |
| Cutting Depth | ▢ 37mm ▢ 47mm |
| Arbor | ▢ arbor 3/8“ match with hole saw 14-30mm ▢ arbor 7/16” match with hole saw over 30mm |
| Surface Treatment | ▢ paint spraying ▢ spraying plastics |
| Mark | ▢ stamp mark ▢ laser mark |
| Package | ▢ regular paper box ▢ single blister ▢ double blister ▢ set |
Arbor
 | Small arbor used with Bi-metal hole saw which diameter between 14-30mm |
 | Big arbor used with Bi-metal hole saw which diameter over 30mm |
Include: arbor with pilot drill bit;
Quality: very High grade HSS Pilot drill bit, easy for work on metal; good performance
Usage: Fit for the Bi-metal hole saws
Hex Shank 3/8" (9.5mm) fit for most chuck