1-1/8" Shockwave Impact Hole Saw

The Milwaukee 49-56-9820 is a SHOCKWAVE™ Impact Duty Thin Wall Hole Saw (1-1/8").

What it is

• Type: Thin-wall bi-metal hole saw
• Model: 49-56-9820
• Diameter: 1-1/8"
• Series: Milwaukee SHOCKWAVE™ Impact Duty
• Shank: 1/4" quick-change hex

What it’s used for

This is designed for fast, clean cutting in thin materials, especially when using an impact driver. It works best on:

• Thin-gauge steel
• Stainless steel (thin sections)
• Plastics
• Sheet metal (up to ~1/8" thick)

Key features

• Thin-wall design (8 TPI) → cuts up to ~40% faster than standard bi-metal hole saws
• Impact driver rated (uses 1/4" hex shank)
• Ejection spring → automatically pushes out the cut slug
• Stop shoulder design → prevents over-drilling into boxes or thin materials
• Built for quick, repetitive jobsite cuts