Amazon.co.jp: PROXXON #27103 Dedicated Engraving Bit 1 Piece Perfect for Brass and Iron Processing [Bold Point Shaft Diameter 0.1 inch (3.2 mm) : DIY, Tools & Garden
Amazon.co.jp: UID No. 820 Diamond Bit & Disc Whetstone (PROXXON), 0.09 inch (2.35 mm) Axis, 42 PCS Set, For Mini Routers, Routers, Routers, Routers, and Pen Routers, Standard Mandrel Size: 0.09 inch (