Features Stainless Steel Material The base is made of high quality stainless steel, corrosion resistant, rust and temperature resistant, and has a long service life. Secure Clamping:The base adopts threaded knob, the clamp is firm and stable, not easy to fall off, and reliable in use. SMOOTH SURFACE The base surface is hardened and sanded, ensures smooth operation and ensures accurate measurement. 3 EXTENSION RODS The base comes with 3 extension rods of different specifications, namely 0-10mm, 10-20mm, 20-30mm. REPLACEMENT BASE The base is used for depth measurement with depth gauge and features precise and stable structure. Specification: Item Type: Depth Gauge Base Material: stainless steel. Clamp hole diameter: approx. 8mm Extension rod specifications: approx. 0-10mm/0-0.4inch, 10-20mm/0.4-0.8inch, 20-30mm/0.8-1.2inch Package list: 1 x base for depth gauge. 3 x extension rods. 1 x storage box. Note: Adjust the appropriate size model before use. Package List 1 x Depth Dial Indicator Base 3 x Extension Rod 1 x Storage Box