... ISO 4 grade, 3. with low noise. The worm wheel gear can be used in electricalwheel and electrical car ... LeftGB7, GB 6, GB 5, GB4Note: 1.The worm shft material can be 40Cr, 45#, 42CrMo etc.or ... according to the customer's requirements 2. The worm wheel material can be Brass, CuSn12Ni, QAL10-4,QA15 ... gear inspect center and test for radial runout: worm wheel gear for Golf car or electronic wheelchair