Product Content: You will receive 2 sets of rollator walker replacement knobs. One pack contains two sets, including 2 screws, 2 washers, and 2 knobs, enough quantity for your daily replacement. High-Quality Material：The black adjustment knob is made of high-quality PP material, which is lightweight, does not deform, has a smooth surface and no burrs, ensuring long-term use. Durable and Sturdy: The rollator walker replacement knobs is made of rubberwood and has a galvanized surface, making the touch surface of the button smooth and even. It is equipped with 304 stainless steel M6 screws, high temperature and high pressure resistance, duckbill washers, wear-resistant and corrosion-resistant, and has good strength and toughness. WIDE APPLICATIONS：You can use these replacement screw parts not only on walkers, platform attachments, but also on drill presses, lathes, milling machines, fixtures, feather boards, or anywhere else that requires M6 internal threads. Easy Installation: Simply thread the hexagonal bolt through the roller frame, insert the plastic washer, install the walker parts front wheel replacement knobs on the outer hexagonal bolt, and then tighten the knob to complete the installation. Featuring a star-shaped knob design, the ergonomic handle adjusts and tightens easily for maximum control and flexibility without the need for additional tools.