MBP Double Pull Brake lever is designed to use both brakes simultaneously. They are designed for cantilever and caliper brakes. This is great for many uses that include riders that go with their dogs, for simplicity, handicap riders, riders trying to stop from accidentally going over the handlebars with too much front braking, trikes, small motorbikes, and more. It is made of durable alloy construction. Made in Taiwan. This brake lever is for RIGHT HAND USE ONLY. All MBP products come with a 1 year manufacturer warranty against defects. We also sell one with a locking mechanism. Look for our other listing on Amazon.