M12™ Hackzall™ Blade-Fiberglass

The Milwaukee 49-00-5400 is a specialty reciprocating saw blade set designed for cutting abrasive materials like fiberglass, tile, and plaster, not typical wood or metal.

What it is

• Type: Reciprocating (Sawzall / Hackzall) blade
• Length: 4"
• Pack: 3 blades
• Material: Bi-metal body with specialized cutting edge
• Application: Fiberglass, ceramic tile, plaster, fiber cement

These are part of the M12 HACKZALL lineup, built for compact, controlled cutting in tight spaces.

Key Features

• Thin kerf design → reduces drag, giving up to ~35% more cuts per charge
• Short 4" length → ideal for tight, controlled cuts
• Bi-metal construction → flexible body + durable cutting edge for longer life
• Specialized for abrasive materials → fiberglass, tile, plaster, hardwood flooring

What it’s best for

• Fiberglass panels (boats, tubs, insulation panels)
• Ceramic tile and backer board
• Plaster and drywall repair
• Fiber cement siding
• Tight spaces where full-size blades won’t fit

What makes it different

Compared to the other blades you listed:

• 49-00-5310: wood scroll (curved cuts in wood)
• 49-00-5324: metal scroll (thin metal cutting)
• 49-00-5400: abrasive-material blade (fiberglass/tile/plaster)