Features Steel material: the depth base is made of stainless steel and carbon steel, which has been ground and hardened with high accuracy. EASY INSTALLATION The depth base features a compact screw knob for easy installation without the need to change the brake caliper. APPLICATION The depth base accommodates blades up to 5/8" or 16mm wide and allows the use of standard calipers as depth gauges. Leather bag: the deep base comes with a compact leather storage bag, which allows for quick storage when you don't need to use the base. Fine workmanship: the depth base is finely crafted with a smooth, flat surface without burrs and an accurate shape adjustment. Specification: Item Type: Vernier Caliper Depth Base Material: stainless steel, carbon steel. Measuring range: approx. 75 mm / 2.95 inches. Operating temperature: room temperature. Package list: 1 x Vernier Caliper Depth Base 1 x leather case Package List 1 x Caliper Depth Base 1 x Leather Bag