20PCs 21mm Black Plastic Bolts Covers Nut Protector and Removal Tool Car Wheel Universal Material: plastic,Protects your bolt heads from corrosion. Compatible Model:These caps fit any car wheel 21mm bolts or nut. Easy to fit,simply push down onto your bolts for a firm fit. Package: 21mm Nut Cap x 20; Removal tool x 1 Internal diameter:21mm