These jack oil plugs are made of reliable rubber materials, thus, they are durable, waterproof, moisture-proof and have strong sealing. Besides, they are rather easy to apply and install. And this size is compatible with most hydraulic horizontal jacks, therefore, you can rest assured that they can well serve your demand. Features - Color: Black.- Material: Rubber.- Size: 1.50 x 1.00 x 1.00cm/ 0.59 x 0.39 x 0.39 inch.- This floor jack plug is made of premium rubber material, easy to use and install, waterproof, moisture proof and strong sealing quality.- Best suitable thickness, lightweight design, exquisite appearance, lifting jack stoppers.- Rubber stopper has excellent heat resistance, cold resistance, dielectric resistance, ozone resistance.- Resistance to ageing property and excellent physiological inertia air, tasteless, non corrosive.- Unique design. Designed in tapered shape with standard demension, easy to plug in or pull out.Packing list: 20 x jack plugs