HSS m2 or HSS m42 bimetal hack saw blade on best flexibilitty and sharper 
Teeth style of 18tpi&24&32 tpi alternative style. 
Hack saw blade 
1. Type: 12"(300mm) length x 1/2" width x 0.6mm thickness 
2. Teeth style: 18tpi&24tpi&32tpi alternative that means in the blade one inch length is 18tpi theet style and the next one inch length is 24tpi and the next one inch length is 32tpi. 
3. Materials: HSS m2 and HSS m42 both available, carbon steel thungsten Carbide steel 
4. Target market: Semi-professionals, professionals and industrial market. 
If you have some intrest please send e-mail to me. Thank you in advance.