Each tool acts like a socket to remove hard-to-reach or stubborn oil filters. Largest size range available - all 100% USA-made. Specific sizes for popular import OEM and replacement filters. Glass reinforced composite material. Provides high torque capacity: handles 140 ft.-lbs. of torque to remove even the most stubborn filters, competitive plastic cup wrenches don"t even come close to this torque capacity. Metal Drive Insert will not deform or break even after years of service. Use with 3/8" drive or with extensions to reach difficult filters; protects mechanic from hot oil contact. Will not crush filter can or cause oil spillage and cleanup expense. Extensive application charts included with set.