When you need a quality motor, look no further than the CrawlMaster Expert 540 from Holmes! The Expert series features the same quality construction as our Pro motors, but with a machine wound armature for an affordable alternative that won't break the bank. FEATURES: Machine-Wound Armature Standup Brush and 7.5mm Commutator maximizes power and motor longevity Gold plated copper brush hood to resist corrosion and provide lowest resistance 5mm web 5 slot armature maximizes smooth startup and efficiency 1.4mm thick can features minimal venting and two high-power FB9 wet magnets to maximize torque and efficiency Dual Ball bearings Adjustable timing Holmes XX springs for consistent drag brake Holmes Soft Copper brushes for high torque and long motor life Broken in for immediate installation and use More information about motor rotation and timing can be found on our blog. Every brushed motor carries a 30 day warranty to cover manufacturing defects. Damage caused by improper gearing is not covered under warranty.