Continental ContiTech 640 8M 20 Hawk Positive Drive Synchronous Belt, 640mm Pitch Length, 5.7mm Height, 8mm Pitch, 20mm Wide Universal tooth profile drops into existing HTD, GT and RPP sprockets; Industry-compatible nomenclature High-grade compounding Requires little, if any, retensioning and less drive maintenance Oil, heat, ozone, and abrasion resistant Designed for high-capacity performance; Higher horsepower rating than traditional timing belts