Features: Converts a presta valves to a Schrader valves quickly and easily. Compact, lightweight and portable. Made of aluminum alloy material, durable and wear-resistant. Lightweight, one conversion head weighs only 1g. Built in silicone sealing rings, easily to inflate and not prone to air leakage. This adaptor is easily to install, you simply screw it on to the pump or compressor for easily tire inflation. Can be used with most pump types including bicycles pumps, hand pumps, foot pumps. Specifications: Material: aluminum alloy, rubber, ABS Color: Black/Redness/Blue/GreenColor/Silver/Golden Type: presta valves to a Schrader valves External thread 8V1, internal thread 5V2 Adaptors size: Approx. 15.5x9.8mm/0.61x0.38inch Package Includes: 4pcs Bike Pump Valves Adaptors 4pcs Presta Valves Caps 4pcs Schrader Valves Caps note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.