4-Pack drain valve screws set. Includes top 8 mm screws and bottom 16 mm screws that fit into M8 threaded plugs. Suitable for most sinks, bathtubs, drain plugs, and as a replacement part for sink hinge drain valves. Easy to operate. Pop-up drain valve screws feature a spring mechanism for reliable pop-up with a single press. The special thread design allows easy tightening and closing. Time-saving, tool-free connection. The Click-Clack connector connects easily to other spare parts without tools. Polished brass surface is smooth, resists dirt, and is easy to clean. Durable brass construction. Made of high-quality brass for strong rust resistance in moist environments. Can be actuated over 100,000 times for long service life. Use scenarios: - Replacing a worn pop-up drain valve in a bathroom or kitchen sink. - Upgrading an existing drain to a tool-free Click-Clack connection in a basin or tub. - Replacing a sink hinge drain valve in showers or bathtubs that use M8 threaded plugs.