100' Fine Line

The Milwaukee 48-22-3990 (100' Fine Line) is a precision chalk reel built for clean, accurate layout work where thinner, sharper lines matter more than visibility.

It uses a high-strength braided fine line (≈0.9 mm width) that produces crisp, narrow chalk marks, making it ideal for finish carpentry, cabinetry, tile layout, and detailed work where thick lines would be too rough.

The reel features Milwaukee’s StripGuard clutch system and a planetary gear drive, designed to reduce internal wear and extend tool life under jobsite conditions. A 6:1 gear ratio allows for fast line retraction, saving time when snapping repeated lines.

The housing is typically aluminum for durability, with a large fill opening for quick chalk refills and minimal mess. The braided line is also abrasion-resistant to hold up on rough surfaces.

Key Features

• 100 ft. fine (thin) braided line for precise layout
• Produces clean, sharp chalk lines (better than bold line for detail work)
• 6:1 fast rewind for efficiency
• StripGuard clutch + planetary gearing for durability
• Aluminum housing for jobsite toughness
• Easy-fill chalk port

Fine Line vs Bold Line (quick clarity)

• Fine Line (this model) → accuracy, thin marks, finish/detail work
• Bold Line → visibility, rough framing, exterior or dirty surfaces

Best Uses

• Finish carpentry & trim
• Tile and flooring layout
• Cabinet installs
• Drywall layout where precision matters
• Any work where line thickness affects accuracy