One 14/18TPI is for cutting soft ferrous metal, the other 14TPI is for cutting stainless steel.
Bi-metal type, M42 Grade, much better harded teeth.
14/18TPI is variable teeth profile, 14TPI is constant teeth profile, suitable for tube, profile and sheet.
Include: 1 pc for soft ferrous metal+1 pc for stainless steel
Description
Imachinist New Bi-metal Band Saw Blade
Length: 93-1/2"
Width: 1/2"
Thickness: 0.025"
Teeth: 14/18TPI and 14TPI
Package: 1 piece 93-1/2" x 1/2" x 14tpi band saw blade for soft metal and 1 piece 93-1/2" x 1/2" x 14tpi band saw blade for stainless steel
Suitable: cutting soft metal pipe tube profile and stainless steel