Due to high demand, secure your pre-order today! Shipping begins right after August 26th. Plus, get ready for the Madworks M4 pen sander. The highly anticipated brother to the D400 is expected to drop by October, if not sooner!
David Union D400 Ergonomic Pen Sander
Imagine a power tool so light it feels like an extension of your own hand. At just 89g, the D400 is purpose-built for hours of fatigue-free precision on plastic models, 3D prints, and delicate jewelry.
As the world's first electric pen sander combining variable speed (1,000–6,000 strokes/min) with a 3mm linear stroke, it reaches deep into tight gaps and crevices where rotary tools fail. Its versatile 4-jaw chuck and included collets (2.35mm & 3.0mm) allow you to easily swap between the 9 included polishing heads, diamond burs, and custom sanding accessories.
Choose Your Version
Contents / Features
Option A: Standard Edition
Option B: Limited Edition Bundle
D400 Pen Sander + Power Adapter
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Tool Holder Base + Self-Adhesive Sanding Paper
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Original M4001 Polishing Head Set (9-piece) + 2 Collets
