4" 10TPI U-Shank Multi-Material Bi-Metal Jig Saw Blades 5PK

What it is:

The 48-42-2310 is a Milwaukee 4-1/8" 10 TPI bi-metal U-shank jig saw blade set (5-pack) designed as a general-purpose, multi-material cutting blade.

Key specs:

• Blade length: 4-1/8 inches
• Teeth per inch (TPI): 10
• Material: Bi-metal
• Shank type: U-shank (universal fit)
• Quantity: 5 blades
• Application: Wood + metal (multi-purpose)

Key features:

• Bi-metal construction: Longer life than carbon or HSS blades
• 10 TPI tooth design: Balanced for speed + durability
• Multi-material capability: Cuts wood and light metal
• Handles nail-embedded wood: Strong enough for demolition-type cuts
• Universal U-shank: Fits many older and some current jig saws

In plain terms:

This is a “do-it-all” jigsaw blade—not specialized, but very versatile.

Compared to others you’ve listed:

• 0640 (10 TPI wood): wood only
• 2160 (24 TPI): thin metal / fine cuts
• 2190 (14 TPI): thick metal
• 2310 (this): wood + light metal + demo work

Best for:

• wood with nails
• mixed materials
• rough cutting / remodeling
• situations where you don’t want to swap blades constantly

Simple takeaway:

• 48-42-2310 = multi-material jigsaw blade
• 10 TPI = fast, general-purpose cutting
• Bi-metal = tougher and longer lasting
• Ideal for demo, remodel, and mixed-material jobs