3" 12TPI T-Shank Multi-Material Bi-Metal Jig Saw Blades 5PK

What it is:

The 48-42-5390 is a Milwaukee 3" 12 TPI bi-metal T-shank jig saw blade set (5-pack) designed as a multi-material / general-purpose cutting blade.

Key specs:

• Blade length: 3 inches
• TPI: 12
• Material: Bi-metal
• Shank: T-shank (modern quick-change)
• Pack size: 5 blades
• Application: Wood, nail-embedded wood, and light metal

Key features:

• Bi-metal construction: Longer life than standard steel or carbon blades
• 12 TPI aggressive tooth pattern: Fast cutting with decent control
• Multi-material use: Handles wood + light metal without swapping blades
• Jobsite durability: Built for framing, remodeling, and rough cuts
• T-shank compatibility: Fits most modern jig saws

In plain terms:

This is a “do-everything rough-cut blade”.

It’s meant for situations where you might hit:

• wood
• nails in wood
• light sheet metal
• mixed demolition materials

It’s not for:

• clean finish cuts
• thin precision metal work (use 24 TPI blades instead)
• heavy thick steel (use 14 TPI metal blades instead)

Where it fits in your lineup:

• 24 TPI (5161 / 2160): thin metal, clean cuts
• 18 TPI (5121): medium metal
• 14 TPI (5190 / 5540): thick metal, aggressive cutting
• 12 TPI (5390): multi-material / demolition / general-purpose