Before purchasing, please confirm the model of your bathroom sink faucet. As shown in the figure, the shower knob has an offset diamond-shaped hole interior located at the center. It is compatible with Delta single-handle bathroom sink faucets. It is not suitable for faucets of other shapes, such as hexagonal or round ones. The set includes: one replacement faucet knob, one button and one fixing screw. ERGONOMIC GRIP: Faceted crystal design provides comfortable handling while adding a luxurious sparkle to your fixtures It is an original replacement part for Delta single-handle faucets and is compatible with replacement parts of diamond-shaped faucets from most brands. The core function of this kit is to enable precise control of hot and cold water temperatures. By rotating the spherical, crystal - clear handle, you can easily adjust the water flow temperature to meet the water - usage requirements in various scenarios. Whether it's warm water for your morning wash or hot water during winter, you can quickly adjust the temperature to a suitable level, providing you with a comfortable user experience. 45-Day Damage Remedy Measures: If your product is damaged during use (non-human-induced), please contact Ryutain. We will send you a brand-new product within 48 hours. Please keep the damaged kit, as it can be used as spare parts. Specifically designed for Delta single - handle bathroom sink faucets, this Faucet QXBS-2 single transparent knob handle kit is highly consistent with the design concept and structural features of Delta faucets. This ensures easy installation and stable operation. Whether it is a newly decorated bathroom or an old faucet being upgraded, this handle kit can fit perfectly, endowing the Delta single - handle bathroom sink faucet with a brand - new charm. The spherical handle, the core component of this handle kit, is meticulously crafted from crystal - clear material. This design is not only stylish and beautiful, harmoniously complementing various modern - style bathroom decors. The transparent material gives the handle a unique visual texture. When light refracts on it, it adds a touch of liveliness and elegance to the sink area. The spherical shape is designed in line with ergonomic principles, providing a comfortable grip. Both the elderly and children can easily hold and operate it, and it rotates smoothly, greatly enhancing user convenience.