BikeMaster is a brand that focuses on quality, performance, and value priced products for motorcycles and ATV's. Grip a larger area with rollers to confidently remove the studs. The socket slips over the stud protecting it and allows you to use the force necessary. No risk of open ended wrenches slipping off. Rollers are bidirectional, they can just as easily and safely install the studs too. 1/2" drive (fit 1/2" drivers). Sizes: 6, 8, 10, 12 mm. Sold as a set. Manufacturer's lifetime warranty.