HTD528-8M: 66 tooth circumference=528.00mm HTD536-8M: 67 teeth circumference=536.00mm HTD544-8M: sixty eight teeth circumference=544.00mm HTD552-8M: 69 teeth circumference=552.00mm HTD560-8M: 70 tooth circumference=560.00mm HTD568-8M: 71 teeth circumference=568.00mm HTD576-8M: seventy two teeth circumference=576.00mm HTD584-8M: 73 tooth circumference=584.00mm Product parameters: Circular enamel pitch=8.00mm, belt thickness=6.00mm, tooth height=3.36mm, material: rubber PACKAGE:1 piece belt