Extraction visibility and consistency: The 51mm bottomless filter enables you to observe the flow column, flow rate, color, and flow column streaks, helping to identify defects before extraction and to better judge the uniformity of extraction. Fine filtration for cup: Ultrafine pore singlelayer filter captures coffee fats, and the portable filter design meets a range of needs to help you achieve an ideal cup to start your day. Ergonomic, detachable design: The 51mm bottomless filter handle in black ABS provides a sturdy surface and ergonomic grip. Its detachable design allows quick disassembly, easy use, and straightforward cleaning with no dead ends. materials and build: The bottomless handle uses ABS and zinc alloy materials, paired with an ergonomic solid wood handle design for a comfortable grip and stable operation. Suitable for both beginners and experts. Specifications Diameter: 51 mm Filter type: Ultrafine pore, singlelayer Construction: Bottomless filter handle in black ABS, detachable for easy disassembly Materials: Bottomless handle made of ABS and zinc alloy; ergonomic solid wood handle design Use scenarios Home espresso setup: Use the bottomless filter to observe extraction characteristics and adjust grind size, dose, and tamping to improve consistency and repeatability. Barista training or quality control: Utilize the clear view of the flow column and the fine filter to practice achieving uniform extraction and to diagnose issues in espresso preparation. Onthego or cafe prep: Portable and easy to clean, suitable for quick setups in small shops or while traveling, helping you maintain quality without bulky equipment.