Feature: 1.double row, metal body 2.good balance 3.lifespan 6-8times of ... as below:- Size(inch)3, 4, 5, 6, 7TypeSingle Row, Double Row, Turbo Row, Radial, SnailConnection22.23mm, 5/8inch -11, M14, M16 etcgrit ... or without holescolor: customize color available More pictues of double row cup wheel as below:-