Blades 493803 Price Each Light Duty Description Blades Light duty HSS blade used for steel and aluminiN1 um Light duty HSS blade used for brass and cast N2 iron. For left and right hand use Light duty HSS blade removes external and internal burrs simultaneously from holes drilled in tubing and sheet materials N3 Heavy Duty Description Blades Heavy duty HSS blade used for steel and aluminiS10 um Heavy duty Left Hand HSS blade used for steel S10 L/H and aluminium Heavy duty HSS tin coated blade used for plastic S10 Coated parts Heavy duty HSS blade specially hardened for S10S stainless steel Heavy duty HSS blade used for brass and cast S20 iron. For both left and right handed use Heavy duty HSS blade removes external and internal burrs simultaneously from holes drilled in tubing and sheet materials S30 Heavy duty HSS blade especially handy for S35 straight edges. For both left and right handed use Order Code 137-4064 137-4052 137-4095 Order Code 137-4065 137-4066 137-4053 137-4097 137-4067 137-4068 137-4054 Price Each